I use pressure, with the Motive, and am very pleased with it. For me, the single most important factor over vacuum, is that I am somewhat OCD. The reason this matters, is many who use vacuum describe seeing small air bubbles in the brake fluid that is being sucked out. While the explanation, that this air comes from being sucked in around the bleeder screw, and does not matter to the effectiveness of the bleed job, this would just bother me. My second reason, is I love the concept of not having to tote the main tank from one wheel to another. All I have to move is my wrench and the catch bottle.