I have had one for awhile now and totally love it! I have not bought any of the curved dies, with the exception of the hearts. Not into curves on quilts! There are a ton of videos on Youtube of good tips to use them. One gal shows how she cuts the fabric one way and then puts it on another die and cuts and ends up with some awesome shapes! Go has now incorporated some of her techniques. Also, if you add them to your facebook, you will notice that every friday morning they do a contest. You go to the link and answer the question of the week. They pick one person to win a go, doesn't matter if they were right or not, they just pick an email! I have cut a lot of my little scraps into usable pieces, have emptied three tubs of scraps this way and filled dozens of containers with shapes, ready to use (love scrappy quilts)! I have also cut several quilts with it and have yet to even think about replacing dies. I am getting ready to order some more however.
Every now and then Joanns puts them on sale (great deal), but you cannot use the coupons for any go products. I am a firm believer in quiltshops.com, I use it to price and buy a lot of my fabrics that I find in lqs at cheaper prices. If you type go into the search box it will show which quiltshops they have that carry it. I have found them cheaper there (and accessories) then locally a lot.