The Unibody model was much more durable than the 2006-2009 models. The one I was using last year was in literally perfect condition, if you take good care of them they will last forever, the only problem with them is the adhesive that holds the rubber base on can deteriorate if you don’t store it in the correct conditions, and the screen can get burn damage from the CPU cooler if you use it with the lid shut.
It was a little more durable in some ways. All the ones I’ve seen have had stress cracks in the lid near the hinges. And yes the bottom rubber comes off of them as well.