I bought mine at the Original Mattress Factory. Bought it firm thinking it would break in a bit, hasn't in years. So a memory foam mattress pad makes it comfy.

So my thought is, the company makes a pretty tough mattress but buy the one that feels good and comfortable when you buy it. Go to the store and lay down on bunch of them, spend some time on them, a good mattress will be around for a long time so pick a good one, by that I mean one that's good for you.