I have the Go and I like it a lot. Not sure if I love it yet. I hate that it only takes accuquilt Go dies while other cutters take several companies' dies. I don't worry much about the waste. I waste more when I try to rotary cut and mess up.
I am hoping to save for the Big Shot Pro but only if I find other companies' dies that I want. Also I've read (but not verified) that the BSP rolls fabric through more easily. The Go kills my arm and shoulder.