I use a version that is based off of charisma and refreshes daily. So far it has worked out incredibly well. No problems at all so far. (in case it matters, half level + cha mod rounded down)
I absolutely 'hate' the refresh per level option. To me that is akin to giving the fighter X number of hp and saying, 'well, hope you gain a level before they run out' or a caster X number of spell levels to cast, same phrase. Especially with the feats that use the action points or classes that use action points. 'sorry, you cant use your feats or class abilities until next level, yeah I know it sucks to be you'
Until I have some major problem with the daily refresh I'll leave it as is (characters who put in the effort to have a lot tend to pick up feats to use options that use a lot, so it is selfbalancing, along with not knowing the success/failure of the roll ahead of time and the number added being variable)