5S on the Mamba Max is a hit or miss proposition. I have a few that do 5S reasonably well, but my others won't. Those that won't do it, won't even arm when I connect a 5S pack.

With the ones that will do it, I only say that they do it reasonably well, because you can tell that the esc is stressed. This stress manifests itself as cogging. If you see any significant cogging, back off of the gearing.

In my experience, my Quarks and Compros do 5S much better than the MMs do. The Quarks and Compros can handle a lot more gearing and run cooler.

The cost of a MM and a couple of repair trips brings you to about the price of either a Compro or Quark Monster Pro.

All of my MMs have been repaired at least once. The only MMs I'm running now are in an 1/8 scale buggy and my MGT conversion with a 9XL and very mild gearing.