Mine has been working well also, with a 1.4GHz Tbird, Crucial DDR and a 330W Enermax PSU.
I did some tests with PC133 CL2 memory versus PC2100 at CL2, and the differences in performance were 0% to 10% (edit: in all cases, DDR was at least as fast as PC133). My tests involved 3D rendering, animation and point-of-view flyby in Caligari trueSpace 4.3. So like ST4CUTTER says, pretty good board if you have some PC133 memory to re-use.
Having said that, there seemed to be more than the usual number of people having issues with their individual K7S5A's. YMMV...