Looks like it jumps you out of the hole thus making it possible to lock out heavier loads.
Looks like a nice training aid......I will pick one up
Depending on which one you choose will determine how much "help" out of the hole. The reactive (blue) doesn't give much help at all. The original (red) give a little bit of help. The maddog (black) is a double ply so it gives a good deal of help.
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