Although I have not used other polishers in practice other than by hand, I chose this one because it was significantly lighter than its power counterparts. Of course, I also had two batteries from another device of the same company. After many hours of sanding (here the weight definitely plays a role), I couldn't believe my eyes. The polishes of Smirdex and Pans, of course not the ones included in the package, worked wonders. The tool, after definitely six to seven hours of work, did not seem to have any issues. For one car, two five-ampere batteries were needed.