TWSBI Diamond 580 Aluminum Fountain Pen

I bought this pen in 2017, and 7 years later, due to wear and tear, it is broken and now unusable. The threading on the back end of the pen, which is used for ink filling eventually striped (made of cheap plastic.) It also started cracking from the same end.

I'm only giving 3 stars and not lower because this is definitely due to me tightening it just a liiitlte too much each time. I thought the construction would last longer!

Got the EF nib. Smooth perfect line with my Montblanc permanent black ink. Very little feedback, as I like it.
Using the inkwell special feed seemed to leave about 25% of the tank empty, so I will have to look at how I'm doing it, and alternative ways to fill it.
I have a VAC700r with a new gold Joco #6 EF nib (a fantastic nib), which was my favourite pen until now, but this is also excellent, and the provided Joco nib is at least as good.

I love this pen. The weight feels nice in your hand, although it feels like most is in the cap, so it doesn't feel too heavy when writing. I do write unposted. I love being able to see the ink inside the pen. The writing is so smooth. I ordered a broad and then worried that I wouldn't like a broad nib, but it's nice to see a large amount of ink make a difference to the ink colour. I do want more of this pen, in the other nib sizes. Good thing they're not too expensive. I have a more expensive pen that doesn't write as nice as this pen. I also like that I can use a syringe to fill this pen with ink samples.

I own 3 Diamond 580 Aluminum pens in a variety of colours. I bought the first when I was thinking of getting back into using fountain pens after a long hiatus, and honestly fell in love with them. I find them very comfortable to use, and have a M, F and EF nib. They work well will a variety of inks: I've used Lamy, Quink and Noodler's in them and, while I have had to play around with the consistency of inks to match the nib size, that is to be expected. The only concern I've had is that the caps have a tendency to break along the metal ring, but the TWSBI North America rep has been extremely helpful and quick to respond with replacements free of charge, something that impresses me even more than the pens themselves. Definitely worth the purchase!

I bought the TWSBI Diamond 580 Aluminium in Extra-Fine 7 months ago and have been using it as my only pen this entire time. I take it to school and work, never had a problem. The piston-filler is very easy to use and you get a lot of writing done before you need to refill it. I've been using Sailor Jentle Midnight Blue ink and when writing on proper paper it really is a treat.