Doughboy pools have the expandable liner option but I decided against it for 2 reasons - it cost more money and it is nearly impossible to dig in my yard without hittings rocks so the thought of having to dig 1 to 2 feet down was not encouraging. (And also I would have to figure out what to do with the likely-poor quality dirt afterward.)

One benefit of the one-depth pool is you can use an automatic cleaner like the Hayward Aquabug. I don't know if this would work in a multi-depth pool so if not, a more expensive robotic cleaner would be needed.