I have been very happy with it so far, the only problem I have had is while tethering. On all of the pre-2.2 ROMs, While tethered, either wired or wireless, my phone would stay fully charged as long as I had it plugged in via USB. Now, on all of the 2.2 ROMs I have tried, After using WiFi or USB Tether ( I use the apps downloaded from the market) for about an hour, my battery has dropped to about 80% and after a few more hours will be at 20%. My battery indicator shows charging, and if I turn off tethering, it will be fully charged again in about 30 minutes. It is almost as if tethering is keeping the battery from charging properly.
I am using the newly released FRF84B at the moment and aside from that issue, it has been great!