I didn't realize how big of a difference a box spring made until I moved and only slept on a mattress on the floor for a few weeks. I woke up every few hours tossing and turning with back pain. After I started using this foundation, the difference was night and day. 

I get this is a "foundation" as opposed to a traditional box spring, as it doesn't seem to have springs. Who cares? It was cheap and it works great.

Pros: Great price