I have the GO and I LOVE LOVE LOVE it.. As for the waste, I hardly have any.. It cuts perfectly once you figure out how to lay the grain line.. Ive got most of the dies, Hubby got me a few at a time for each holiday.. I do recommend you buy extra mats.. I wear mine out pretty quick and YES to me they are disposable.. I dont think the dies or mats are that expensive plus if you can find them on sale its a bonus...
As with everything you will have love 'em and Hate 'ems.. I suggest you try it out.. I was hooked the first time i saw it..