Halcro,
I have been using the Technics EPC-100CMk1-4 and the EPC-101C for years as well as one of the well-mentioned Empires and a couple of the Graces. I have tried some of the AT MMs, other Empires, and the Garrott P77 (and probably one or two others) as a result of this thread. I have also been prompted to try out some of the Graces not mentioned here) and have enjoyed them immensely.
I have mounted those carts on a variety of vintage (i.e. contemporary to the carts) arms of the period, where possible specifically matching the armwand or arm to the specific cartridge where specified in the tonearm manufacturer's literature (several tonearm manufacturers specifically refer to specific cartridges (by manufacturer and model) in their manuals). I don't THINK I have done these carts an injustice. I have in the past couple of years compared some of these carts to some of the great MCs of the day as well - the top-level Audio Technicas (I like the low impedance models), Supex, Audiocraft, Accuphase, Fidelity Research, Sony, old Koetsu, etc. carts. Since discovering one of the best MC headamps of the time, I now understand that it is eminently possible MC detractors are not getting enough out of their MC cart.
Personally, my desert island top three of vintage carts (i.e. from the time of those tonearms, and assuming all were equally repairable) to match with those vintage arms would p-r-o-b-a-b-l-y include three MC carts. I have yet to get my AKG P100E fixed.
I just got the bearings on one of my EPA-100Mk2 tonearm changed to grade 3 silicon nitride (rather than grade 5 ruby) and the tonearm rewired with a silver litz run to silver eichmann plugs (i.e. straight to phono input). I am looking forward to trying some of the MM carts on this arm, as it may become the lowest-friction highest-rigidity tonearm available to me for medium-high-compliance carts.