KCee I've been playing Snell's for awhile now and like them. Both the Black and X seem very good. Black feels better IMO, but I probably get a bit more out of the X.
The MTB-X seems to be as close as one can get to a Pro V1X. Looking at the data the MGS guys did with a robot one can't argue to try an MTB-X.
Dean Snell interview with MGS.