On the subject of Bennies.

It would seem to me, the gaming world is distilled into two camps. Those that like bennies, and those that vehemently oppose their use. I am on the fringe of the latter. Every time I've tried to use them, the players hoard them like a dragon hoards gold. In a Pathfinder game I ran, I tried using Hero Points (a/k/a Bennies in disguise). Even though it allowed for a reroll. Even though it allowed for acquisition of small common items. The players ignored them. Did they think if they collected enough of them, I'd let them bypass a tough encounter? or just skip to the end of the game? I'm still not sure. They certainly weren't considering them as a way to steer the story.
Bennies should not be used to TAKE narrative control of a story. The GM/DM has already laid out the direction of the story. If you're playing in a game, and you don't like the direction the story is going, either quit the game or grow set and talk to the GM/DM about it. If he is unresponsive, run your own game. You might have gathered from reading some of my past posts, that I'm a big believer in players running the games they want, not hijacking the GM/DM's plot. This stems from having too many players look at me and say "I just want to play, being a GM is too much work." ***calming breaths Tem, that is a different rant for a different time***
Back on topic...
All too often, players need to be reminded that the life of an adventurer is a hazardous and sometimes fatal undertaking. Bennies give false hope. They promise a change of bad luck frequently without actually delivering. The player spends a bennie, rerolls, and blows it a second time. Then they whine. Can't stand whining. I've had a PC, sitting on 3 hero points like a hen on eggs, die while attempting to tumble past a Slaad. I pointed out he had the option of using a hero point to reroll, and he looked me, straight faced, and said "Why don't you just let me do it?" If I were a more violent man, I might have gone to prison after the homicide trial. Instead, I let the Slaad kill him on his 3rd attempt.
Bennies, Hero Points, whatever you choose to call them need to be integral to game play. Not added as an after thought. FateCore is on the right track.
I'm not a big fan of letting players try and get out of the bad choices they make, never have been. Way back when (the 80's) during the 1st edition days, if you made a bad choice, your character paid the price. then you rolled up a new character and remembered not to do that again. The PC thought process has devolved since then. There is a pervasive attitude of entitlement among players lately. They want to be awesome. That's great, but in order to be awesome, you must overcome the obstacles placed in your way. The first time, not through the overuse of second chances. That is how great stories a made. Remember folks, appease the dice gods, and your dice will perform for you.
Maybe, if the players would use the bennies for more of their intended uses, I might be inclined not to malign them. However, I've not seen any evidence of that changing anytime soon, so I will not be using bennies in my games, if I were actually running any.
Anyhoo... You guys keep the debate alive. Have fun with that. I'm gonna stand back here in the past and keep the archives, for when the youngsters realize us oldschoolers were right. :-)

Thanks for listening.