I love building puzzles but my family is not too thrilled when I have to take up the table space until I'm finished building my puzzles so I've been wanting one of these for years. This is great. I'm able to take my puzzle out and work in it anytime I want and roll it back up and put it away when we need the kitchen table. This one is unique as you have to blow something up in order to roll your puzzle up and keep your progress. I've seen others that do not have this so I'm not sure how the others work but this is great. I should have had one of these in my life a long time ago. This is a must have for any avid puzzle builder who doesn't have space to leave there puzzle out till it's finished.