I've just received a pair of re050 195/45/16 84v XL for the front wheels, the actual rear Pzero Nero are shot, so the front ones go in the back...I've got them on the mini (205/45/17) and they're pretty good everywhere, stiff sidewalls, good in spirited driving on dry and VERY good in the wet, even with low temperature and some melting snow. I agree with murcod, the ARE a bit noisy, especially after 10k km.
Honestly I don't care, my exhaust cover pretty every other sound...missus complaints too...
I'll give you some feedback in a few thousand miles.
I had the Re040 on my old S2000 (205/45/16,225/40/16) and they were crap in the wet and cold, although wonderful in hot days and on track. My father has them on the 350z, but I drive it very rarely. I think the 50 is a more all-rounder, and it has some more tread so they last longer, or they keep enough of it for the rain longer. They bigger improvement is that they keep a lot more grip at low temperature.