theres two main balancers that work.... Dubro friction balancer, imo that ones good enough for a hobbiest but if your chassing out minor flaws in your system, step up to the Top Flite magnetic. if you spend the time and make it so the prop can be let go anywhere on a magnetic balancer like that and stays, your footage will improve alot. the prop noise will completely go away and it'll fly like it never has. on an octo with 15" props takes me 10-14hrs to completely nail down but man, it's so worth it. The friction balancer gets it close though, close enough to where props are still loud, in my experience it won't fly perfectly in wind, motors will run hotter and your flight times will be less.......