We stopped at the mattress store knowing we wanted a memory foam mattress after having a 3" topper on our pillow top spring mattress for the past few years. My husband has "the jimmy legs," and it was getting to the point that his middle-of-the-night thrashing to turn over was leaving me completely unrested.
The store rep walked us through all the options, and let's just say the one we liked was more than out of budget, with an extra zero at the end. We were attentive to the specs listed of our favorite (on purpose), and immediately Overstock'd it as soon as we got to the car. Voila, enter this mattress: the exact same specs, and we could have literally gotten 20 of them for the cost of the one we'd wanted at the store.
When it arrived, we hauled it upstairs and put it at the foot of our bed so it could rise. It is quite heavy due to the density of the material, so be aware you'll need some muscles to get it up stairs, or even to the next room. After unrolling it, it was only a few inches thick. Over the next few days (I forget the exact prescribed amount of time--but let it rise the whole time), it rose to 14". It *does* smell like chemicals for a few days, so open a window and run a fan to get the off-gasing fumes away from your sleeping quarters. Note that it does dissipate pretty quickly--we have had ours for about a month now and there is no trace of scent (and my husband calls me the "super sniffer").
The first night sleeping on this mattress was heaven. No jimmy legs. I slept so soundly. Now, every morning, I wake up incredibly rested. I thought the commercials were exaggerating, but this kind of mattress is no joke.
My husband was annoyed the first night--because he had no springs to propel him in his usual springboard, jimmy-legs athletics. Well, he finally learned what it's like to wake up every time he did that! ;) By the second night, he had already adjusted. By the third night he agreed he had never slept better in his life.
One big upside to this mattress over others is that it has convection cooling--so it doesn't accumulate your body heat. I am always cold, so it didn't bother me at all that our previous mattress topper did that, but my husband is always hot, so this was a very welcome change for him. It didn't make me colder at all, which is good to note.
This is by far the best purchase we have ever made. Not only was upgrading to this size of mattress absolutely clutch for us (we're both tall, 5'11" and 6'5"), the gel memory foam means we are sleeping better than ever.
I don't speak lightly when I say this mattress changed our lives, and I can't believe what a great deal we got, too!