If you are using Vienna Ensemble Pro 5 or BlueCat’s Patchwork or MB-7 to host VST instruments in Pro Tools 11, than you have a whole new world of plugins to explore.
Make sure though that before you buy VST plugins for Pro Tools, you test a trial version first in VEP5 or BC’s Patchwork. It should work properly and without glitches. Of course it is also important to nag VST plugin developers for AAX versions. They won’t develop them if no one asks for them. Do you know of any other great VST plugin developers that Pro Tools users should check out?