I ran across a very interesting article in Digital Content Producer (May, 2006) which compares multicam editing in FCP, Premier Pro, Avid Xpress Pro HD and Sony Vegas/VASST. Discusses both the pros and cons of each system.
Vegas comes up smelling like a rose. Just what we would expect.
I've been using Ultimate S 2 for some time now working with 2 - 4 cams. A couple of days ago I finally had a need for more cams so I fired up the VASST InfinitiCAM. Even better than the US 2 multicam plug! Very similar of course, but a few more features and I like the marker system of infinitiCAM better. I ran the 9-cam set with no problems. Other than the fact that I wish I had a smokin' hot dual cpu system...