Like it says on the novak site, "dissipate noise and smooth voltage spikes, and will also improve the performance of these speed controls by reducing the operating temperature by 10-15 degrees Fahrenheit."

Noise, doesn't bother me because I'm spektrum

Spikes, OK?

Temperature, is a definite YES! It keeps it at least 10 degrees cooler. I never go above 90-93 on hard bashing day, but that's with a fan also. It used to be 105-110 range before the cap. I think it made a bug difference.