Really like the preheat feature - toasty bed when you first get in then it comes down in temperature to a comfortable sleeping temp. I don't get overheated during the night...  

Only downside is where the connector is located - which is why I gave it a 4. It is located right where your feet lay and as a result there is a cooler spot so you have to move to one side or the other.  

Pros: Preheat feature - warm bed when you 
Cons: Connector is located right where your feet lay.