I used to have the GO! but now have the Big Shot Pro. I love this machine! Its easier to turn and sturdier than the GO!. Its more in line with the Accuquilt Studio. I can use both Sizzix and Accuqiult dies. It will also take the Studio dies. I really like that you can cut more layers at a time with this machine than with the GO! The Sizzix dies feel sturdier and stronger than the GO!. Best of all, its way cheaper and the Sizzix dies are also cheaper. BTW, Scrapbook.com carries Sizzix dies and has frequent sales on them. The best place I've seen to buy the Big Shot Pro is Overstock.com. as they carry a "package" that includes all the extra long cutting pads you need to utilize the larger dies, this is the package aimed at quilting, rather than paper and craft cutting (although you can use it for both).
Hope this helps!
Solomae