I have used Pierco brood frames for some time now. One problem that I have not seen discussed is due to the excess bee space when a brood chamber of Pierco is placed beneath a chamber of wood frames. When trying to separate the two brood chambers burr comb holds the Pierco frames, making them lift up off their frame supports. This causes difficulty in lifting off the upper brood chamber. I have to insert the hive tool and pry down the Pierco frames, while holding up the brood chamber with the other hand. This is awkward, and often the bees do not like it at all! Ted Fischer Dexter, Michigan USA