i definitely like a firm bed and when i first moved in here i couldn't find a bed i thought was worth spending money on so i slept on a pad in my bivy-sack on the floor for about a year and a half.
i really liked it for about 4 months.
then winter came and i liked it quite a bit less, but wtf i'm tough.
then after 9 or 10 months my shoulders started to hurt. and right around a year they hurt all the time and there was obvious swelling on the right side which was messing me up pretty good.
the next half a year i kept one eye open for a bed that wasn't a total piece of shit.
i settled on a tempurpedic and it slept great right off, but really the first month or so i couldn't get over the fact that i'd just spent 1500 on a frickn piece of foam. well, i got over it, and two years later it's gone from a 'shitty piece of foam' to being one of the best things i've ever bought.