I asked that question last week, and it seems that most levers work fine with Vision base bars. The specs say that the base bars take only Vision brakes but it's not true at all...so far people report that the following levers work fine for them in their Vision bars:
-Vision
-Blackwell
-Cane Creek
-Dia Compe 188
-Profile QS2

See the thread here http://forum.slowtwitch.com/...rch_string=;#1227390