I use to work at a store that sold both Ballistik and Rebellion. I wasn't impressed with either. I could see using the Rebellion for roller, but not much more. The Ballistik's were just terrible. Poor quality, terribly unbalanced, boxy shape, etc..
I was impressed with the quality of the Ballistiks my friend got. The one he was using finally broke after a good 3-4 months of abuse between Sportcourt and concrete, averaging 15-20 hours a week (and he got the cheapest one)