I've got about 10 miles on the freewheel and 10 miles on the fixed cog, with my bones so far. Bike operates great in both circumstances. I agree with Mark that it does seem slightly big. I am 5' 11" and went with the 56cm. I am glad I didn't go 58.
As far as bike feel, the 18t seems great with the cog, but I might beef up the free wheel with a 16t in the future. Brake works great, as does everything else on the bike.
I personally ended up customizing mine, aesthetically. I made the following mods:
Cutter Racing Saddle (white) - Real Cyclist Item #CUT0038
Vittoria Rubino Pro 3 Tire (1 white, 1 lime) - 23 - Real Cyclist Item #VIT0033
Fi'zi:k Bar Tape (apple green) - Real Cyclist Item #FIZ0055
Blackburn Flea Front USB Light (green) - Item #BLB0037
All of these greens seemed to match the cutter logo real well.
I also added a few other items (chrome toe clips, white straps, top tube pad)
Overall, I enjoy this bike a lot. Weight is decent, it looks cool, and it is everything I need to cruise around town.