Igor, has anyone looked at or tried the Turnigy 60 Super Brain 60 AMP ESC https://hobbyking.com/en_us/turnigy-super-brain-60a-brushless-esc.html? It is advertized as "ultra fast microprocessor controlled". I have a couple of local helicopter pilots that are using them now. They have stated that response time is better.
No, when I did my survey last time it was really costy, so I do not plan to do it again, since I really have very well working ESC having all features we need. However, if maker says he uses ultra quick processor, it does not tell anything about the program itself. Response time of governor is more about its tuning than processor speed. The only way is to take it and test both in real life.
Well done and set regulation will add power in ascending parts of figures, solution with dealy in regulation will move that part of highest rpm later, what will cause quicker downward parts of figures, in extreme, it will work just opposite - accelerate on bottoms and brake on tops. It is visible especially in wind.
So the solution is qick reaction of timer (I did my best - I worked on tuning 4 years until I was happy and before I released first timer out and I use that setting till now without change), quick ESC (certainly not that dedicated for heli guys, they need SLOW reactions, so I do not believe there could be good ESC which is not done with C/L on mind, means I will believe more on Castle, Schulze, Jeti than something from R/C sources) and low moment of inertia of motor (small diameter), spinner (as light as possible) and especially prop - I use light 17g hollowed props.
Only then come user features - slide switch, programming on field, available settings for good sslope adjusting etc.