I like the Tumbler die a lot. I use it more then I thought I would. Don't buy the bigger square dies like the 6 1/2 " size. It's too easy to cut those with a rotary cutter. I like the small size hst and small squares, the 2 1/2" strip cutter and the diamond, circle, hex shapes. The ones that take a lot of time cutting. A die will come with the Go that will have Square-4 1/2", Square-2 1/2" and Half Square-2" finished triangle unless you get a special package deal.
I Have a Notion online shop
has the the Go for 262.00. I If you go to the yahoo group they immediately post the sites that have a sale on the dies.
forgot to say order extra cutting mats when you find them on sale. The die will say what size cutting mat you need. If you order the strip die, you have to have the mat to fit the long die.