the good  our cats took to this immediately, and use it both to lounge and play ... very stable (and we have BIG cats) and seems to be pretty well built .... the bad we ordered green and recieved grey, despite the box being marked green  (decided it was more trouble than it would be worth to return it) ,  also the middle perch is tilted downward slightly instead of being level, but again, not enough of a problem to be worth returning