I've had the GO machine as soon as they were available. I would buy it again. DH and my kids know what to get me for gifts, prepaid cards for new dies. My next new dies will be the Drunkard Path and 1 1/2" strip dies. My favorite die has been the Tumbler die. I use it to cut my larger scraps into tumbler shapes.
I buy most of my dies at Bayside Quilting. It's usually free shipping and dies are on sale a lot.
http://www.baysidequilting.com/