I had a few hours with rotary on me. Very gentle artist healed like a dream. I credit the artist, but he said he used rotary primarily because of the sound. He still lined with a coil and did some shading, but large spaces were rotary. The sound is much more soothing. Pain? Hard to say, very light hands helps, granted it he layered the black and stacked color differently. Pneumatic is the newest, and similar sound effects. Id like to get a Tebori and Pneumatic tattoo someday.