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I have a Motive power bleeder, and to me, it is most useful for flushing old fluid out, however, I still do 5 or 6 old fashioned pumps per caliper with an assistant to ensure no air in the lines before I call it a done job.
The professional power bleeders have a membrane that separates the brake fluid from the air pressure, thus ensuring you are not pushing air (and moisture) into the new brake fluid. The Motive bleeder does not employ this, and I don't entirely trust it to not at least mildly aerate the brake fluid.
I realize this goes against the wisdom of most who very happily use the Motive unit, but to me, it is worth considering.
Patrick
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