I have the Go and the Go Baby. The smaller dies can be used for the Baby and all of them will fit the Go. Someone will post the dies are too expensive, the mats wear out fast, and too much fabric waste. I took all that in consideration for about five seconds before I ordered the Go three years ago. I pre ordered the Go Baby as soon as it was ready.
I have 1/4" fabric waste, the dies are always on sale somewhere on line and the mats cost less then a rotary blade and I'm still using the original mats that I bought 3 years ago. I don't use the same mat for every cut so not cutting in the same spot and they last a long time. I cut card stock with my dies too, for templates, still sharp as ever.
There are many die cut machine on the market now, some electric. I have tried many of the brands and will stick with my Go, it's easy and does a great job for me.