So far, I have used only one size, the 4"x5.25" for A2 card backgrounds. It has cut well, but I'll have to be careful because it is starting to warp in spite of trying to angle it into my Big Shot machine. I like that there are so many sizes to choose from, but the dies are very thin. I wish that the sizes could be stamped onto the rectangles so that I don't have to measure each time. I marked and separated the die that I use the most. Also, I purchased (to be delivered later this week) a magnetic sheet, figuring that might be a good way to store the dies.
The various sizes accommodate many card sizes and scrapbook pages. I like the simple design and versatility. Many other products sells for much more, but I will now look to Lifestyle Crafts for good dies for a good value. Thank you!!