I have a 6 pot Gatorbrake on the front, along with a 203mm rotor. The braking force is very good, and its extremely easy to lock the tire up with minimal effort, but still reasonably controllable. I have never used any other high quality hydro brakes, so I cant really compare directly. For high speed braking, you don't need to squeeze extremely hard to slide the front tire, even at 40+...
However, the pads do rub from time to time, over hard bumps or turns. It stops by itself after a few seconds, its not that big of a deal to me. I only use friction brakes for emergency stops or to stop completely after regen stops working at low speed, the pads look like they will last several years. I've done several stops from 40 in a row, just to test it out, and it handles it fine. The rotor discolors, but the pads take it.
