The square flip-its die has become a favorite! It makes it so easy to create a "special" card (with some "wow"!) in a short amount of time. With so many options to adapt this card, your creative possibilities are huge. You can drop in some of the smaller Sizzix "Movers and Shapers" to cut windows in the part that flips. There is a link to very helpful tutorial videos. I am highly satisfied with this purchase!
(I also have several of the Sizzix pop-up card dies -- which are a lot of fun. However they take much longer to assemble than flip-its.)