Dont know the more expensive MTronics, but the cheap ones are real bad. Strange faults from time to time.
My personal favorites: CS Rocket MAX, with active frequency control. And Robitronic Spirit.
From the CS site:
AFC is the active frequency control that leads to hammer hard acceleration on one hand and super smooth acting on the other. The frequency of the power FET transistors is depending on the speed of pushing the throttle stick. Fast throttle movement--> low frequency Slow throttle movement--> high frequency In the end you have more control over the car from the sticks. AFC can also be disabled.