I have the sizzix big shot and the vegabond and I love them both. I prefer them over the cuttlebug, but I'm sure some cuttlebug users would say the same about their machine over the sizzix.
Personally I like the sizzix for its mobility and that I can use pretty much every die out there and I actually use it more than my cricut. The vegabond can cut multiple sheets at a time, I've done as many as 5 sheets and still no issues.
Great! I just ordered the Sizzix -- it was $59.99 on Amazon, and a flower die.