It has its pros and cons.
Pros are it is easy to do and can balance without a machine. A 265/35/22 will take about 32 grams of powder (little over 1 oz) sometimes they will take a bit more. It is also always correcting the balance of your wheels by shifting between the low spots on the tires.
Cons are that you get a lot of hop in the tires at low speed from the media shifting around until you hit about 35mph and it hits the low spot on the tire. This happens every time you stop and some people mistake it for the wheel/tires riding poorly.
I have mixed reviews on this from my customers. Some of them love it and say it rides like factory and some say that is just gets on their nerves at low speeds.
I have them on all of my dually trucks with big wheels except for the lifted trucks and we use stick/knock on weights with them.