I have the Purple Vibe. I find it a good medium/light oil ball. On scorched lanes it hooks too much to be really considered a dry, dry lane ball. But on most light conditions it is a very good bowling ball, hits hard, carries well, and does what it is supposed to do. I haven't tried the blue Vibe. In fact, I can't really understand releasing a slightly more aggressive version of this ball. I would have gone opposite way, but I figure they know what they are doing.
Chuck