Having only ever used hacker and flightpower packs in my planes and boats in the past I ran into a problem at my LHS when they were out of stock. I was directed to Hobby King and for the money thought I would give these a try for my modified King of Shaves brushless cat. These packs ran as hard as the hacker top fuels or flightpower packs and according to my temp gun stayed cooler after a hard run. They have balanced perfectly every time thus far which is better than some of the more common packs from traxxas and venom that my LHS sells and mates run. Overall a quality product and I will be ordering more soon.