I bought a case of 10 uni-ball Signo DX 0.38mm pens, 1 Signo DX 0.28mm, and 2 Pilot Spotliters from JetPens.
The 0.38mm one is spectacular. I've been using it since I got it. My Extra Fine Pilot V-Ball and uni-ball 0.2mm (roller ball pens) lose their top favorite positions in my list.
The 0.28mm is actually a bit too fine for me though I immediately fell in love with the sharpness. Very smooth ink flow. I tend to put pressure on the pen while writing, so the pen helps me to sort of loose it up a little bit. Still, I think 0.38mm is fine enough for heavy-hands like mine.
I'll put some pictures of my writing with these pens on here soon.