with the sale that started today I had my DH get me for Christmas the 12" Cube Companion Cube--primarly cause I want that 6" Drunkard's path--that size is not available separately.
I've only had the Go for a year and don't have a huge amount of dies (strip bundle, triangles in squares, log cabin, 12" Qube) so the Qube makes sense for me--my friends that have lots of separate dies don't think it's worth their $$.