Never had a Kaweco pen at all (they seem too small for me, but they are pocket pens with normal size when posted), but I really like my Pilot Metropolitan Bronze Lizard with a medium nib, and I just ordered a black crocodile with a fine nib. My metro has been very durable that nothing happened other than an extremely tiny dent on the bottom of the barrel when it fell from about 3 feet onto tile. The medium nib on it is very smooth, starts right up. Probably my only gripe with it is that the outside of the body can be too slick depending on how you're handling it.
If I don't mind the medium (western fine) nib, then it's usually my carry pen for it's durable and reliable so far. Otherwise I have a vintage Pilot Elite "Big Cap" with an extra fine nib that's small like the Kaweco but probably a little thinner. Hoping the Black crocodile fills the void in the middle, being a beater pen but finer on the line width (but not too fine, thus smooth).
Besides, it's only $15 ($20 if you want the Con-50 converter, but the converter it comes with, takes in so much ink for just a single squeeze of the sac, and does nicer than the separate Con-20 squeeze one you can get with just the tiny little squeeze window). it's also very easy to fill a used Pilot cartridge (very wide mouth, probably why it flows well, the feed is the only bottleneck).
If you got crappy paper, go with the Fine Nib (Japanese Fine), less likely to bleed and feather. Kaweco's extra-fine is still thicker than the Metro's Medium.
Edited by KBeezie, 10 May 2014 - 02:40.