Sturdy, stays to the window well. Only issue is that the plastic is separated in the bottom which means you have to use bird seed that's bigger so it won't fall through the cracks. We haven't seen birds using it so far, but the seed level is going down so -something- likes it. Haven't had it for very long though, so the birds just need time to find it. Also worth noting, it's not solid in the back so the feeder opens up directly to the window. I thought it would be a solid piece of plastic. Other than that, the product was as described and it hasn't fallen off the window yet!