We've got the Studio Cutter by Accuquilt and love it for production work.
If you're going to use a die cutter for home purposes, the Accuquilt Go cutter works really well, is a lot cheaper, and folds up to travel or store away. The studio cutter requires a separate space and needs to be set up all the time, and it's considerably larger.
The advantage I think of the Accuquilt system over the Cricut is that it's specifically made for fabric cutting. They're coming out with new dyes all the time and they have really good customer support.
I haven't seen a Cricut in action, but looking at the design it seems like it would be a lot slower to set up and use, since it's essentially a plotter that cuts. It would seem that you'd have to spend time stabilizing the fabric on the cutting mat, and the fact that fabric is flexible (where heavy scrapbooking paper is not) would seem to be problematic in getting accurate cuts.