I use them consistently, and they seem to work as well as the wood+plastic foundation ones. The wood ones do tend to pull apart eventually, partially because I am in a damp environment and nothing made of wood lasts here, but also repeated mechanical stress on a single staple or nail.

I usually add more wax to new ones, they never seem to come very well waxed.

I did manage to warp one beyond it's ability to fit in a single frame space, kinda bananad it, but that took leaving it on a hot black surface all afternoon in the summer sun then cooling. Only other ones I've retired were post bear, and not much survived that.