I have the Shimano Nexus 8 on my commute bike (DaHon Curve SL folder) and like it a lot. No problems with it in a year and a half of use. The gears are spaced well (even though my bike has 16" wheels) though my relatively flat commute keeps me out of first and eighth most of the time.

Like the shift while still feature and didn't take long to get used to it even though all my other bikes are derailluer equipped (well, 'cept for my fixed gear bike of course).

Haven't noticed any increased drag on cooler days, though of course, it doesn't get really cold here in Los Angeles.

Rick / OCRR