Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
I don't know about UMA on your 8320 but I stuck this on my 8310 and had serious signal loss issues. I've had .10 and .18 as well and had the same troubles. Obviously it's a beta so I'm not complaining - just blew it away and reinstalled the last stable release from ATT. No sweatski.