I do love several different RPG systems, not always because of the quality of the rules, but there are other reasons like nostalgia, nice shiny books with nice art, popularity making it easier to find other players, etc. But Hero is the best ruleset bar none. It's not even a contest. I know I'm preaching to the choir, but if only people could see that in play, once chargen is done, it offers a simple and fast-moving experience. Flexibility of character concept is not the only selling point.
So anyway, I've bought sets of Hero Games books several times over and will continue to do so. My most recent thing is collecting all the different 3e genre games. I was kind of surprised how sophisticated the rules and presentation was already by the time of Fantasy Hero (1985), it was already comprehensive only 4 years after the first release of Champions.