I have the sideliner uncapper from Brushy Mountain. I bought it used from a sideliner and past president of the Guilford County beekeepers. I asked Kurt why he was getting rid of it/what he didn't like about it. It was much easier to use with 2 people working it, and he usually extracted alone. My neighbor and I generally extract together, and when we are doing a larger round of near or over 100 frames, the sideliner saves time and is easier on my back than bending over to do manual uncapping.
The roller/cutter technology has a few issues. You will notice in the video that the frames of honey used were very fat. Those work fine. Ones that are capped, but of variable thickness do not get cut as well. It takes a few passes to get as much cutting as the wheels will do, and then some scratching to finally get the low areas. Having the frames warm so the cappings are soft also helps. I am speaking of experience only with the Brushy Mountain sideliner. Still, I like it for our larger rounds of extracting. It is much faster than a cold knife or the Maxant cappings planer. You do not get nearly the amount of cappings wax and the bees seem to make use of the cut open cappings left on the cells. I do not see shards of wax around the bottom boards when I put the extracted frames back on a hive for clean up or re-use.