This is wonderful, very easy to use. Just make sure you tape your paper done to the glass cutting surface.
The only downfall is: it's not an actual square. The corners are slightly rounded. If it was totally square, you wouldn't be able to cut in one fluid motion.
The square does give a little more room for pics or design over the circles, (which I love also).
Used in this layout: Checkin' out the Beach 1