Yes, yes, yes, and yes. I think of it as an Ultra-G on steroids.
I bought mine from Peak late last year. Just checked the RMSK web site, and they aren't showing that size now. They still show a couple of other sizes. There were a couple of other dealers selling Peaks at one point or another, but I really don't know anything about them, or whether they still have any AAs for sale.
You might try the B/S/T forum . . . .
Worth it? That is a hard question to answer. For all kinds of reasons, I'm really not the person to answer that question for you.