Welcome to the Quilting Board, Snowrose! I bought a Go! as a birthday gift to myself a couple of years ago and I am so glad I did. My cuts are much more accurate now. Love it for hexes, tumbler blocks and making lots and lots of HSTs and squares. The dog ears are cut off so everything is so easy to match up. I love it for using up scraps -- and if you're careful about placement, there is little waste. I just cut up a ton of scraps to make a throw for my sofa and am happily snipping off the left over strips to make pillows.
Do shop around. I got the best price on SewforLess.com and I get dies when I have good coupons for Joann or when Accuquilt has a sale. Be sure to write reviews on the Accuquilt site when you buy something -- whether there or elsewhere. You'll earn points for every purchase and for each review and they can be used towards purchases in the future.
And since you're on the way to Joann -- get there quick! The Red Dot fabrics are 50% off this weekend!
Have fun!