I had a GO!, but sold it. I liked it well enough, but it didn't do all that I wanted. I bought the Westminster/Sizzix Big Shot Pro. I can use all my GO! dies I had bought, plus now buying the Sizzix/Westminster dies. I also scrapbook so I can do all the other dies in it too.
I did see where you can buy an adapter tray for the Studio, but that machine is pretty much out of my price range to begin with.
I just recently got my machine and paid a little over $300 including shipping! It's an excellent machine and I don't regret it at all, as I did with the GO!