I decided to try this because it looks sturdier than the \"name brand\" one. I just put it together and wanted to share my thoughts so far. One of my cats did climb on with some toy motivation. The other one attempted to twice but stopped when the wheel started to move. It seems promising though. Pros: Arrived 2 days early, sturdy, plenty of room (bought the largest size to be safe), pretty simple to put together if you've ever put together furniture before, came with a bunch of extra hardware Cons: the carpet insert liner thing is one piece and it was about an inch too short. It would have been better to have multiple pieces to make it easier to install, ensure it stays straight when you're installing it, and to replace it in the future. The clearance between the wheel and the base (where the cat would be running) is small, but after my cat stepped on I realized it's just big enough for a toe bean to go in so that does worry my slightly. Also the base ends (on the outside of the wheel where the fish lock is) have a large enough space for a cat to easily put their arm in so it's a concern that one cat will be messing around with an arm in it and another cat decides to jump on. For now I will make sure it's \"locked\" when I'm sleeping or busy until I know they are more familiar with it. I do have high hopes for it and will update after I make more progress with the cats.
Scott 
