Sounds like the OP has made up his/her mind, so FWIW. I offer a theory at the end regarding innersprings, air, foam and water beds.
We had a Sleep Number king size for 3-4 years, we didn't like it but we kept it that long because we paid thousands for it, finally sold it for 10 cents on the dollar. It's not all bad though, just didn't fit our needs.
Pros:
- Each side adjustable separately, that's great. DW liked her side firmer than me. Someone mentioned it's noisy when it's filling, and it is, but you're not constantly adjusting. You wouldn't be adjusting in the middle of the night often if at all, so you wouldn't disturb your partner.
- If you're a back sleeper, I suspect the Sleep Number mattress would be great. This may be a critical factor missing in the posts above IMO.
Cons:
- We're side and stomach sleepers, and the Sleep Number doesn't do well there IME. We tried almost every setting from about 20 to almost 100. What seemed comfy on my side was different than the best setting for stomach.
- If I woke up on my side, my shoulder was just aching! If I let air out to soften the bed, my spine would be curved, also uncomfortable.
- If I woke up on my stomach, my back was aching from being arched too much. If I increased air pressure to straighten my back, and then rolled on my side, aching shoulder again.
We have a latex foam now, and it's been a little tricky too even though we have different firmness levels on each side. And we've had water beds too.
Funny thing is I usually sleep better in a hotel room, almost always a basic inner spring mattresses I assume. So we wouldn't count out inner springs, and that's probably what we'll buy next time, even if air and foam are fashionable these days.
I don't know, but my theory is the independent springs allow the surface to conform without the hammock effect air, foam and water beds can't escape? YMMV!