So far, so good.  Our cat hasn't used it yet, but he's a semi-feral stray, so he's very cautious.  It was easy to put together, although you have to be careful not to cross-thread the plastic screws (metal would probably be better), and it would be nice if the door flaps weren't stick-on.  Very clean-looking, and the raccoon footprints on the roof wiped right off.