I like that! They need to also have the option of having the inner ring drop lower than the outer ring, so you can fill it with hot water and have a hot tub with a built in bench.
If you go to their website, it shows that you also have the option of having the center ring raise up, becoming a table, either in the middle of the dry patio or the wet pool.
Speaking of things everyone needs--one of these would definitely be a great addition to set next to that pool...