I just got sent a d2g to replace my d2 (actually still on my d1 contract, so maybe these things will keep breaking and then I'll get a d3, and d4 etc, but that's another story)
Anyway, I've been using fission rom 1.4.3 for the last few days (stock was only getting ~5 hours of battery, this switch got me up to ~11 hours). I have noticed no problems with the rom.
I also don't see it getting too much acclaim in these forums which leads me to wonder if the other rom(s) (fenom?) are better in some way or if there's something wrong with fission? Is there anyone else who is cool with just using fission?