I really want to learn how to use rotary buffers and am looking at buying one. My friend has a beater vehicle and has agreed to let me learn on it. I know quite a few of you use rotary buffers and was wanting some input surrounding their use. Are they difficult to operate? Are the results significantly better in comparison to those derived from DA machines? Are polishing times cut in half? How long does it normally take to become proficient with them? I'm particularly worried about burning the paint on the vehicles countours, such as on corners; what can be done to prevent this? Any tips, techniques, opinions, etc would be greatly appreciated.