My comment may come to late, but I'll weigh in anyways...
I'm in a Silver Age Sentinels (Tri-Stat superheroes) game that's been going for almost a year now. I've found the system to be very good - my personal comparison with Hero is that I find it simpler and lacking some of the flaws I perceive in Hero.
I have no idea how it would work at a lower power level, like heroic fantasy, say. A regular sword in Tri-Stat does something like 8 damage; our characters are wielding magic staves, breathing fire, and so on, which often does 60-100 points of base damage. (It's a sort of mystically-oriented superhero game.)