Some like buffers such as that. You'd have to pay me to use one as I just hate em. The terry bonnet type 9-11" buffers IMO just don't do a very good job. The bonnet seems to move very little as there is too much give between it and the foam backing surface. Also the shear size of the buffer makes it hard to use on many vehicles. I also think they have a tendency to fill seams if you go over them. My experience with them over the years was what kept me from buying a PC years ago. I just figure the PC would be a more expensive piece of crap. I was wrong of course. One thing I think the bonnet buffers do good is if you wax a dark car and get shadow marks you can go over the surface and remove them easily.