Have run this for just over 48-hours, upgraded from v1.21 b05. After uploading, reloaded previous settings and everything connected perfectly the first time. VoIP quality is better. No significant difference in speed. Have noticed none of the occasional dropped signals. Have three client pc's, one server, a VoIP box, a PS3 and a Wii. All work as good or better than before. Have not noticed any of the problems described by others -- login in screen is quick to appear and settings are saved on first try.
I have no legacy "b" devices.
Road Runner cable modem, DIR-655 A4, v1.30 beta
Cheers