I bought this item (actually only 1 and not the buy one get one free) several months ago and have waited until now before submitting a review.
The short version: I have been very impressed with the results.
I have had lower back problems for the last few years, and have also been the type of person who woke up a few times during the night due to discomfort.
My fiance has had a Tempur pillow and said how it helped her sleep better. I was somewhat pessimistic a pillow change would help me, but purchased one of these as it was far cheaper than a Tempur. It really has made a massive difference.
I now sleep very soundly, and have woken up without a sore lower back. I also feel that my back is stronger and generally better. I certainly don't feel nearly as fragile as I used to.
To clarify too, I am not receiving any other kind of 'treatment' for back pains, or training at all. I do intend to get some additional/professional aid, but now this would be pretty much precautionary rather than corrective help.
My only comment would be that it took me a couple of nights to get used to the foam pillow - it is quite hard compred to feather pillows, but once you get used to it (literally within a couple of nights), you'll be fine and you'll start noticing a difference quickly. At least I did!
I can happily recommend this, and wish only I had gone for this kind of thing a long time ago.
Good luck, and sleep well!