Acebird, I bought one last year. It has a V shaped knife that is heated by steam. The frame is placed on a moving bed that you push over the stationary knife. On clean, plump combs it does a magnificent job. On comb that has held brood, it works exceptionally well. The issue I have with it is that I?m double handling frames. With the knife, burr comb, propolis on frame edges and skinny sections on some frames are all dealt with at one time. With the Lyson uncapper, the process becomes more complicated and takes more time.