I've put in a lot of these windows and most of them seem to be pretty good, better then Pella anyhow. I haven't seen any windows that are really as solid as I think windows should be.
I think windows, especially expensive ones, shouldn't have a lot of play in them. When you start cranking, I think it should move instantly, even if you stop and go the other direction. There's just too much slop in all of them. But like I say, when nobody is perfect, you have to take the best of what's there and Andersen makes a decent window, IMHO.