I have used the speed bleaders before. They work ok to bleed an empty system because you can open the furthest one up and pump in a bottle. I always have a second person pump the pedal and bleed each wheel the tried and true way old method as the final bleed though.
I heard good things about them, but never tried them myself. Also, I've heard that the early version had a problem leaking after a while, but they supposedly re-designed the internal valve a year or two ago and the newer ones work better now.
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