I went Gullor Picasso (fine) -> Lamy Safari (fine, extra fine) -> TWSBI Eco (extra fine). The Picasso is very smooth, but the grip is slippery and the feed clog

I went Gullor Picasso (fine) -> Lamy Safari (fine, extra fine) -> TWSBI Eco (extra fine). The Picasso is very smooth, but the grip is slippery and the feed clogs. The Safaris are very durable - good pens if you're not that careful - but the converters don't hold much ink, and even the extra fine nib produces a somewhat wide line. The Eco is excellent. Fine line, and the piston fill means plenty of ink. I have two, and they are nearly all I use.