I've been happy with my Protek 20A from Amain. During the RC Pro Series Canadian Nationals, we were powering an iMax B6 charging at 2.6A, an LRP Competition Touch charging at 5.5A and a Hyperion with the dual charging channels, each charging at 5A....plus I had my cell phone plugged into the USB port on the charger. Good little workhorse, and quiet too.