Makes a high pitched whine, uneven heating.
I was excited to get this, because of good past experience with mattress heaters on cold winter nights.  But this one is weird -- the control box emits a high pitched whine all night, and the heating itself seems uneven.  It'll take a really long time to heat up, and then be TOO warm.  The right thing to do would be to return it...but it's going to be a pain to take it back off the bed and package it up again.
Rating: 3 stars