We have one, series 10 or12 I think, before it we had a temperpetic (sp). I hated it, way to hard on my back and I would wake up sweating every morning.
Our sleep number is the half split version, with a full bottom, split top. I love that I can have a firmer setting, my wife a softer setting. We have the one that elevate your head and feet and has the vibrator in it. Set the timer and it returns to your normal sleeping setting.
Only think I do not like is the split between us, if you roll into the hole as we call it, you can get trapped. I would not get the split setup again.
They are expensive, but our bed has spoiled both my wife and I, and we have trouble sleeping in other beds now.
We have the King version, its smaller than a normal king, and only sleep number sheets will fit it. The bed does record or grade how you sleep every night. Does not do much for us, because the dog goes up there and lays down after we leave for work, and messes up the data.