I bought the Sinclair power cutter for the Wilson trimmer. It runs with a 3.6 cordless screwdriver. Once you get used to it, it is very accurate. I keep my trimmer in a small vise.
over the years I've used 6 different trimmers, The one I use the most is the RCBS power trimmer with 3-way cutters. You have to develop a "system" to properly place the case in the holder to make sure it is aligned properly with the pilot, but easy to figure out and very repeatable. i like the ability to easily adjust not only COL but inside/outside cut as well.