the 5x10 dies fit, but instead of their shims I've seen some people cut up fiskars cutting mats to use as shims. any of the larger ones (6x12 and up) will not fit, though some have had success with shaving off some of the side of the 6x12 if there is a bit of clearance before the die blade, I wouldn't go that far myself though.
this blog post on the adjustments necessary is pretty helpful
http://quiltingcrossroads.blogspot.c...to-use-in.html