About seven years ago I bought some full cell Pierco frames (about 20) to test them out. They work fine, the bees use them over and over just like natural comb, and they are extremely easy to uncap either manually or with an uncapping machine - just scrape right down to the cell tops! However, as with all things, there are a couple of problems: 1) These frames are heavy compared to wood or plastic foundation frames. An empty super feels like it has quite a bit of honey in it already. 2) In a poor honey flow, the bees sometimes don't fill the cell up to the top. Then when they put a capping on top of what they filled, it is almost impossible to uncap without punching a hole in each and every sunken cell. That sure takes time, even using a cappings scratcher to punch a line of cells at once! Ted Fischer Dexter, Michigan USA