I agree with Kathy. My Cricut was such a money hog once I couldn't cut my own designs that I gave up in it and went with Silhouette. It has already paid for itself after a year because of the designer software and subscription service. I actually gave my Cricut away and don't regret it one bit.
As for SU paper, I don't have any so I can't say for sure, but after reading a few boards out there, I don't remember anyone saying it doesn't. I know that's not very helpful.