Just installed the 1055T last Friday, works great. Running ESXi 4.1 with no problems. Running it on a homebuilt system, but its performing like a champ. More than enough power for any test environment. Its more powerful than most of the CPUs I have running in production honestly.
My whitebox consists of these parts in case you are wondering...
MB FOXCONN A88GMX 880G
2X MEM 2Gx2|CORSAIR CMX4GX3M2A1600C9 R
AMD|PH II X6 1055T 2.8G AM3