Quick update on the new Beta software:  I've been running the new client (1.5.0 beta1) now for 1 day 10+ hours for 2 Antminer UIs, 18 Block Erupters and a Jalepeno.. All are doing well, working normally. 

The Antminers are extremely stable, with only 1 noted "miscalculation" over the time period between the two of them. They continue plugging along a 1.545 Ghps.

No issues with reconnecting after a couple of BitMinter hiccups.

Overall, a very stable client. 

[I'm running on Core i7 platform, Windows 7.  Also running a couple of stratum proxy instances for some ASIC Cubes as well.]