I run all my VST plugins and VSTi plugins on Pro Tools using the fxpansion VST-to-RTAS adapter. At $99, it's a must-have. It translated every plugin I have. It's a wrapper, but I haven't noticed a single issue with latency or had any other problems with it. My VSTis sound great, and my VST plugins work great too. That said, I already had all of my best plugins in RTAS format, since 99% of the major manufacturers already support it. But now I can use all my freeware and "cheapware" stuff too. Lemme tell you, it's pretty cool running FruityLoops inside of Pro Tools...