Chrl - I bought the adjustable base with the sleep number. But I had been investigating adjustable beds/bases for awhile. The sleep number people just use a bed base made by Leggett & Platt, www.leggett.com , so I don't see any reason you couldn't buy them separately. btw, It is one of the best adj bases out there, as long as you don't need high/low feature, it only does raise head and/or feet.
Curt - one idea for Genie might be to buy the twin size and only have it raise under you. It would tilt the mattress some, but shouldn't be a major problem I don't think.
Sjean - level transfer is nice. When we 1st got it, it was "up" there a ways, major pita.
Rick - yep me too, saved some bucks.