I've been a well known Lane#1 honk on this site for several years. But at the same time, I'm a ball whore and have balls from several other brands as well (Ebonite, Columbia, Track, Hammer, Motiv).
For Motiv, I have the Raptor P7 and Thrash. I've had the opportunity to test out the Primal for several games. The bottom line is that Motiv puts out very good equipment. I personally like the Raptor as an oiler better than the Virtual Gravity or World Beater, and the Thrash (a new 2012 offering) is as versatile a medium condition ball as you'll find from any company.
I'm finding Motiv to be one of the best kept secrets out there. If bowlers in general weren't such Lemmings and learned to experiment beyond the easy big boy choices, you'd see a lot more Motiv being thrown on the lanes.