Hmmm…since I have both of these coming I can certainly find out. It would also be interesting to see what effect it has on all four. Looking through posts, MX139 seems to be the one that baffles everybody - and MX137 has been a mixed bag. So it would also be fun to try it with the “weaker” ones, see if it brings something out.
Oh heck, Visionary, let’s face it, I think P79 would be fun to try with everything!