Tom makes a good point, there is a down side to them, they can be messy, and you waste brake fluid. If you have a steady supply of willing helpers, I prefer the two person method.
I use one because I live in the boondocks, no one is usually around when I need them, or I have to wait for the helper to take a shower, dry her hair and get dressed or some other lengthy delay.
Have a great day,
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