I tried a couple last year just because I try everything new. They are pretty UV resistant, unlike the milk cartons someone mentioned. They do have one drawback that I've found so far: they do not EXACTLY fit with existing wooden supers. There's no gap, but the curved corners do stick out and are not square like the wooden supers. My bees had no reluctance to draw out plastic frames in plastic supers. I also tried a mix of plastic & wooden frames with wax foundation. That worked OK also. When I mix plastic & wood frames, I do every other one. I hope that helps! -Danno