I was thinking of that as a house rule for Mutants and Masterminds (which has a similar system, but is much more generous with the reroll). I think it's better if you don't feel like you wasted the Hero Point because you rolled low.

That said, it works best if it's a success/fail type thing. I understand pathfinder has a lot of things with critical success and critical failure. I guess you get it back if you don't score better?