Got an F500BT for $200 including the amp and ipod cable.
Never used it with the previous firmware.
Impressions:
UI Pretty
Phone paired easily but then was semingly lost after reboot, but it just took longer than expected to find the phone.
Contacts transferred (TMO Shadow) easily .
Contacts UI is totally useless. I have multiple entries for each person with no indication what they are.
Video playback (divx AVI, 480p/30) is choppy and useless from SD.
Video playback from USB is very unreliable. Tried three thumb drives.
BT is OK. But not great. Takes a while to find the phone.