I’ve installed the update from FRF83 (500K) on my own Nexus One, and installation was smooth, as always.
It is unknown what the update brings and whether it will be the last one before we see the final official Eclair>Froyo update.
You can download the update here if you didn't get the OTA yet:
- T-Mobile Nexus One: FRF83 > FRF85B (500KB)
- AT&T Nexus One: EPE54B > FRF85B (46.5MB) - this will update your stock unrooted Eclair 2.1 AT&T Nexus One to Froyo!