The title says it all. This heating pad is large enough for my entire back, which is quite a feat considering my height. As someone who has back and neck problems, having a single heating pad that can get most of the affected area is just grand.
The heating settings run the full range, though I wish there were more of a difference between medium and high. It's not a big deal for me, though, as the medium is hotter than the 'high' setting on most other heating pads.
And finally, the reason I bought this, no annoying timeout on the controls. Just an easy-to-use slider that stays on for as long as I need it. Old fashioned, but still the best option.
One thing to note: Don't judge this product from the first use. For some reason it takes a few prolonged activations for it to get up to its full heat after unboxing. Not sure why, but I strongly recommend giving it a couple of tries if you think it's not getting hot enough for your liking. Believe me, my first impression was the same and I'm glad I didn't box it back up.