I'm wondering about this. Whenever I've tried flows dialed to my boots, they were quicker edge to edge than any 2 strap I've ever tried, including CO2's, Cartels, SPi's, and Force SL's.
Highbacks falling down is almost always user error. On older models they had problems with the locking mech wearing down, in the last 2-3 years they fixed that. Should not be an issue.
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2014 Flow Rush LTD 153 $125 plus shipping