Jeff, I was very surprised to see those cabanas still available for us 90-day folks this morning. Not something we want or need, but nice that they weren't all gone for those who might be interested.
We got one 2 trips ago when my MIL came with us. She was in a wheelchair and required oxygen on occasion. It was great to have as she could plug her machine in, get out of the sun and watch the kids on the beach.
Now we are suffering from having done it once and being spoiled.
Last trip, I reserved one and was trying to get a family concensus on either the Atlantis or a cabana, but not both (too expensive) and I'd cancel one. My wife saw the reservation before a decision was made and got very excited, and I really like the Atlantis. So everyone got a cabana for Christmas.