Goulet service and packaging pre-eminent, as always. This is my first stub nib, and I love, love it. Ink flows as well as any of my expensive pens with gold nibs, and I lean toward large ink-capacity, piston fillers. This pen checks all the boxes. Highly recommend.

This pen is a good overall pen but being a vacuum pen has proved troublesome for me. When I fl it, it sometimes just leaks massive amounts of ink on the paper. I need to circumvent this occurrence by shaking out any 'excess' ink the pen has. If given the choice again I would certainly pick a budget friendly converter pen instead. The fine nib writes more like a medium & even so still clogs when using a shimmer ink. Knowing this I would recommend anyone to either purchase a fine for non shimmer use or a medium for shimmer ink. Do not use pen flush as the ammonia in it will cause the plastic to become brittle over time. Overall it's a good pen just there are better alternatives out there.

First I noticed the excellent build quality, heft in hand, and feel of materials, all of which we've come to expect from TWSBI. After inking up with Diamine Oxford Blue, I initially found the pen scratchy/toothy with the Fine nib. Not what I was accustomed to or expecting... I have a Fine nib on my other TWSBIs, which I usually feel is very smooth, relatively wet and very pleasant. With the Diamond, however, I couldn't get past the "Extra Fine" characteristics of the Fine nib. I fought with it on and off for weeks trying to like it. Then I switched the ink on a whim and what a change! Ostrich Blue/Black seems a much better choice for this Fine nib in the Diamond. It changed the pen and made it the pen I wanted to like from the start. It is still on the extra-fine side of Fine, but it is much smoother with the Ostrich ink. I am finally pleased with the pen and will enjoy many years of using this excellent-looking writing instrument.

I purchased with the stub nib and it met my expectations. This 580 is my new daily go to pen. I have never owned a demonstrator pen before, but love this TWSBI in the Navy accents. I filled the pen with a long-owned and unopened Pelikan Saphire ink. Wow, I feel this is a great combination of ink color with the 580 ALR Navy trim. Just beautiful!

I am new to fountain pens, but I am glad that I gave the 580ALR a chance. I wasn't ready to spend a lot if money on a pen so this pen was perfect. I work in the medical field and write a lot. This is a true workhorse pen and I enjoy using it with Sailor Kiwaguro ink. Medium nibs so far have been my favorite. I don't anyone will be disappointed in giving this pen a try. I also get a lot of compliments from patients!

I really like my TWSBI 580 ALR with a broad nib, but while it starts out as a wet writer the nib dries out as I write until it stops writing. At this point I need to play with the fill mechanism to re-wet the nib for another long sentence.While I really like the pen, the frustration of it stopping really detracts from my perceived value of the pen.

Ordered this as my 2nd most expensive pen purchase as its still hard to justify the money on a student budget. Regardless, the piston filler is decent and holds a good amount of ink. When posting the cap, Id be careful when taking it off as its all too easy to release the piston and have an ink spill by doing so. It was a bit clunkier than I expected but I was really excited to have my first 1.1mm stub. Unfortunately the flow isn't the best and its an incredibly stiff nib. I tested it with several different inks and found it to be moderately inconsistent among both wet & dry types. All in all, this is not a bad pen by any means, however the stub nib surely left something to be desired on my end.

I have been a TWSBI fan in the past, but I am not enjoying this pen thus far. While I have had an unusual number of dry starts, this is generally something I can fix with a little tuning (which I should not have to do with a new pen). My biggest complaint, however, are the sharp edges where the blue aluminum edges on both the cap and on the tip of the pen closest to the nib, which is generally near where I grip the pen. I haven't actually cut myself on them (yet), but they are noticeably sharp, and unnecessarily so. I may contact Goulet to discuss a return, but want to warn any potential purchasers that these are pretty sharp, poorly machined aluminum edges that TWSBI has done a poor job manufacturing.

I really like how the medium nib writes with Pilot Iroshizuku ink. It seemed really thick and wet at first, but after wiping the back of the nib a few times on a cloth, it was writing perfectly.

My only issue is the textured blue part on the top of the cap. It has a weird little overhang where the metal meets the top of the plastic where the logo is, it feels almost sharp. None of my other TWSBI Diamond 580s have this and I got two of this same pen for my husband and I and they both have it so I'm thinking it's specific to this pen.

A huge step up from the eco and eco-t i had been using. Feels more solidly built, and has an appealing look. It does post but awkwardly, so consider that if that worries you. My medium nib was smooth out of the box. I am sure I will order more in the future.

This pen has blown me away. It is so good it has become my primary pen.

Very solid pen, very smooth writer. Don't expect much shading or variability (think Lamy rather than Namiki Falcon), but it does the job very well. And the demonstrator clear barrel is fun to look at.

My Lamy pens are misbehaving (ink drying out quickly or leaking) and I'm tired of dealing with it, so I wanted another pen to fill their slots in my roll. I've loved TWSBI since my first Diamond 580 and continue to. The pen holds the sweetest spot in my mind for a quality, affordable pen that should last a very long time. The metal grip section feels good, as well as the pen overall. And sheening and/or shimmering inks show up wonderfully with the 1.1 mm stub nib. TWSBI has a fan for life in me and I wholeheartedly recommend them for your first or forever pen if you're looking.

Such a sweet writing pen!!

I have three of this pen in different colors, and I've never had one dry out on me.

Absolutely the BEST writing pen that I own.

This is my second TWSBI Diamond 580. I like the heavier weight compared to the TWSBI Eco, but both models are great writers. The cap on the 580 AL R has a sharp edge where it meets the finial, and I wish they had rounded it off a little better, but it does not affect function.

A great writing pen with a large visible ink reservoir.

I feel like they've improved the writing experience a bit, which as a leftie is much appreciated.

This is a beautiful pen and a great upgrade from a TWSBI Eco. It has a decent weight and feels solid! I bought the stub version. It is a smooth writer.

Good overall pens ive had one break at the metal ring on the cap so this is a replacement for now

Excellent quality pen, this is my second fountain pen, first being a Lamy Safari, I am very pleased with this pen. The weight is perfect, super comfortable to hold. The only thing I’m having to learn to work with is the tip does dry faster than my other pen, but this could be the ink…either way, very pleased

Great pen, got it as a gift for somebody, but witnessed it being inked and used. I like that it's a demonstrator, and having loaded it with blue ink looks very nice / professional. It makes a good line with a fine nib, feels comparable to a standard fine (e.g. Lamy). The one I got seems to have very minor hard-start issues only at low angles, which will hopefully self-resolve.

It was given as a gift and he loves the size and color of the pen as well as its writing style

Tried an ECO broad nib but it was too too broad Thanks Goulet for accepting the return. This pen with a medium nib is perfect. The navy blue 580 with green ink looks great.

I bought an inexpensive fountain pen a couple years back and enjoyed using it a whole lot. At times it would dry up or the ink wouldn’t flow out consistently. Finally, I bought this TWSBI fountain pen and my experience over the last few months has been amazing. It can hold much more ink than my previous pen, it hasn’t skipped or dried out on me yet. It makes me want to write more!