You can achieve some great results with a DA on our paints but I'm not going to lie - it takes some work!! You need a fair degree of patience. To do it properly requires probably two full days, just of polishing.
I bought Menzerna polishes because all the reviews I'd read over on DW suggested they were good for BMW's. Between their range of polishes and the Sonus pads there was more than enough capacity to deal with most typical paint defects using the DA.