I think my mamba max pro has had it, the merv stutters at low acceleration as if it isn't receiving enough current, but I have plugged it in with a 4s 5000mah lipo and to the same results.
I contacted castle, but getting it shipped (internationally) to them and having 'em fix it will be a higher cost than buying a new esc.
I'm using a neu 1110/1Y with only 2s lipos, I'm thinking of a sidewinder sv3. Has anyone dabbled with the hobbywing esc for the merv? I'm loving the ace/hobbywing esc for my mt4g3.