I've got it too and use it a lot for simple block designs - the rotate and flip options are great and there's a 'magic' button where it does all kids of crazy layouts!
One word about the yardage - it tells you waaaayyyy too much so unless you want to enhance your stash, I'd double check the old fashioned way. I used it to design the door quilt I'm making and when i worked out yardage on paper, (and checked and double checked the maths!) I discovered the program told me twice as much as I actually needed!
K x