The Mk III sure looks nice but my Mk II is still new. Maybe I’ll trade out my 21 Mk I (is that what I should call it?) and get the 21 Mk III, but I only use my 21 for horizontal surfaces anyway and it never stalls. The variable trigger is the most interesting innovation and it would help when priming the Rupes blue and green pads (that I’ve quit using). I love that Rupes listens to detailers and improves their products. I hope the power wars are over. More power is not necessary.