"...will do fine for most machines at stock speed"
Yup, don't expect much more than stock speed.
Some PNY Spectek sticks clock higher for me than the ones Micron sells directly. This may be the ram that Micron cannot sell to anyone else (PNY etc.). My last Micron Spectek stick was a PC2100 (label underneath read PC2700), that absolutely would not run over 143 Mhz in an NForce2 board. I've got other brands of PC2100 running at 230 Mhz.