I did a super dooper crazy spin 1200 rpms or whatever it is, and its not budging. I don't know if its because our dryer is bigger or not as light as the non condenser dryers but its not budging. I have a friend giving me a mat, and I've been offered a stacking kit from another gf. I've done a LOT of reading, and the the two reasons they say a stacking kit is needed is if your washer goes unstable with big loads (never happened here) and if you have a little person who hangs off the door, its like 5 foot off the ground and I highly doubt it.