I recently got a Cricut Machine and I love cutting vinyl on it, but was having a problem with air bubbles.  My husband had the idea to buy one of these to see if it would help and it really does!  I have used it numerous times to help flatten out vinyl but now also use it every single time I piece together paper as well.  It smooths everything down and makes it look really neat and crisp.  I'm so glad I got this!