Do you mean the hybrid M1 or the tube ML2 or ML3?
Personally I use Stealth Dream with M2.2 hybrid monoblocks.
I have been slowly replacing Synergistic Research cables with Stealth over the past few years. I also tried Shunyata, Elrod, JPS, Acoustic Zen and Purist along the way. However, I tried power cables mostly from the wall to power conditioner for pre amp/sources or on CD player as I could not get 2 cables to try on power amps together except for Stealth. Anyway, in a round about way, I eventually ended up with Stealth. Probably best to try them out yourselves though as most of these cables perform very well but it just depends on your taste and personal preference as well.