I LOVE LOVE my Cut-Ups!! I used a bunch of them this weekend when I made my scrapbook page for NSD and as I made 35 ATCs for church.
One thing that I know people struggle with sometimes is when a die cut gets "stuck" in the die. I love how many of the TCP Cut-Ups have little "release" holes that you can stick a pokey thing in and pop out the die cut. But if your die doesn't have a release hole, I like to take a piece of scrap paper with a line of adhesive on it Simply stick your die cut (still in the die) to the adhesive and pull the paper gently out of the die. By using a lower tack adhesive you should be able to unstick it with no problem!