I run 3s in my hyper 9e with mamba monster/2650 kv combo. No problems at all...ever. I even let my 10 year old drive my new toy with a 2s pack and it worked fine... not something I would recommend, but it functioned without issue.

Excellent run times, runs cool, plenty of speed (17 pinion usually), and if I need to pull a tree stump or shred tires even faster I just throw in a 4s pack for uber stupid power.

I very rarely run any boost via my castle link programming, and if I run on a smaller track I lower the output power to 75%. The system has more than enough power on 3s to allow me to gear my buggy for the track and back my power down where W.O.T. is attained under control. I may not be the best driver on a given track (almost a guarantee ) but nobody has run away from me.

My monster is pretty versatile and bulletproof. I have zero complaints and would run the same system again. Because of my experience with it I will wholeheartedly recommend it to you and am confident you will be happy.

Dan