These perches are sturdy, easy to install, and even the smaller one is big enough for an 18 pound cat who is suddenly about to be an indoor cat in a small house with 3 small dogs, the largest of which is his size and a known entity, unlike the other two. We figured he'd need to be able to get away from them, and the leafy screen seems perfect for that.  However, he hasn't moved in yet, so I can't yet tell you how popular they are with the cat.  They do look pretty cool on the wall though.

Update about a year later: the cat liked it, but the dogs took it over to watch out the window for things at which to bark.  Not quite the result we were going for, but hardly the perch's fault.