if you have already used a rotary and feel comfortable using it then by all means get one, now as far as holograms they are mainly caused by too much speed,too much pressure, not using a finishing polish, using wrong type of pad and not following up with a fine pad/polish combo. if your using wool without following up with say a orange lc/same polish you used on wool then use say a black lc pad with a finishing polish you shouldn't have holograms. however, some paints are so soft that you could use a micro abrasive finishing polish and still have slight micro-marring/buffer trails, when that happens my best advice would be try a finishing pad with a pure polish containing no abrasives. just depends on the person, i could have gotten a da a week ago but i chose new pads,backing plate and chemicals instead as in this area most people dont know what paint correction is. and most "detailers" use just wool and a glaze...however im the type who picks up things really fast. only issue i am having is the new pads i got on my car the rotary seems to try to follow the pad rotation due to the curves in the panels of my car....it just depends on the person, some use a da and rarely use a rotary some use a rotary and rarely use a da....