Basically just about anyone can use a random orbital and not have to worry about hurting the paint. They are NOT fool proof but they are definetly more user friendly. With a high speed/variable speed buffer you definetly have to be careful. It takes alot of practice and patience. Some people are better than others with the high speed buffer. I typically use the buffer for "rougher" cars (severe spider webbing, scratches, severe swirls, holograming) then follow with the pc. But if you're paint is in pretty good shape, a random orbital may be all you need.