I bought the Go and it was okay but I wasn't happy with how limiting it is, and I had trouble turning the crank. I sold it and bought the Sizzix Big Shot Pro and am in LOVE with it. It's so much easier to use and takes any Go dies PLUS any Sizzix dies and most Studio dies. One that I really wanted was the 10" square but the Go isn't big enough to take a 10" die (I think the bed is only 10" so the biggest is probably 8"?). The sizzix is, however, quite a bit more expensive and does not fold up so it takes up a lot of permanent real estate. Oh and it weighs about 50 lbs. Sizzix just had a 75% off sale and I got 5 dies for less than the price of one at retail.
eta: You can also get custom dies for it.