I don't use pressure bleeders and won't allow their use on my own stuff, even when available. The reason is simple and has little to do with pressure bleeding itself. It has to do with the brake fluid in the unit. How long has it been out of the bottle absorbing atmospheric moisture? I'm not going to guess or take a chance. I want the fluid going in to have the highest boiling point possible, and that isn't going to happen with fluid coming out of a pressure bleeder.