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I believe the difference is that the standard is just a bleeder valve..and the "high-po" one is a bleeder valve (fine adjustment) with a ball-n-spring for coarse adjustment.
I have the Hi-po...bought it off a friend for cheap...and it's no better than a Joe-P MBC. It's no worse, either...
BUT - I'd go with a basic, name brand (Joe-P) ball and spring controller.
Tried and trued, and less $$$.
- Brian
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