UPDATE: This was supposed to have the feature that brought it back to the wall when the head is raised, but it did not. I notice they have since edited the product description to remove that, but when I purchaed it, this was an important listed feature I was expecting. Removed two stars for that reason, even though the rest of the original review below still stands.
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I've only had it for a few days, but it is exactly what I was hoping. Raises very high on both the feet and the head, in small increments, so you can get just what you need when you need it. There is a convenient quick button in the middle to return to flat. 
It was as easy to assemble as screwing on the (very solid) legs and connecting the power cord. Very nicely designed product.
Using a Nectar mattress with it; bliss!