Just throwing my experiences with the K7S5A NONPRO:
I had the issues where 2 sticks of pc133 would not work properly at 133fsb (one stick worked fine, 100fsb worked fine - and ddr worked fine)
It lasted for about a year and a half to two years, and then I find that one of the mosfets has fallen off the board (taking out a number of caps with it)
I suppose it was decent for the price, and these issues may have been fixed with the pro version, but of course, YMMV.