GO is larger - has a wider cutting area that GO Baby...and size, weight of cutter is different. As far as how big a block can one make using components cut with any of these......as large as you want....remember these cutters cut pieces as you would with a rotary cutter. The difference being this cuts the whole piece i.e., triangle, at one time not in several cuts as with a rotary cutter. There are groups on Yahoo that are dedicated to die cutters and they would be able to direct/answer most of your questions.