I just got my first Motiv ball, the red Primal Rage, about a month ago. Like any ball it has its time and place. It works well to start the night, but by the end of the 2nd game it is time to go to another ball. I usually switch to a solid cover ball for the 3rd game as the Rage starts to get very over/under. The Rage carries very well, but I have not found it to be any better than my Radical, Columbia, Track, or DV8 balls. My Motiv experience so far has not convinced me that I want to run out and get another.
Motiv has exploded here, and the shop I use is very Motiv-centric. They will happily get you whatever you want to order, but really like Motiv. Another local shop is owned by Motiv staffers, so they are selling a lot of Motiv too.
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