Yes,we used this type of servo years ago & stopped after so many complaints,the ramp speed & lack of low end torque topped off by the boards burning out in 2-3 out of 10 we discontinued buying them & switched to the type with brushes.
We have tested & even have the 1100 watt servos for sale BUT have found that it lacks the punching power @ low speed & won't run as slow as our little FS550 servo does with a speed reducer on it,the brush type of motor also seems to have more low end torque.We stopped using the electronic servos years ago & have had alot less problems do to their simplicity,they also seem to have a long brush life.