I replaced my old SDRAM with the Rev 1.5 PC133, and I must say.... I am less than impressed. I would trade this stuff for Crucial in a minute.
I benched it against a stick of generic Micron Chip, and the Mushkin was about 2 points better in Sandra. The generic also hit 110fsb no problem, on Asus A7V, the Mushkin doesn't like anything above 107fsb.
The REV 1.5 chip was ordered as a replacement for the crappy Mushkin Budgetram I originally bought. It had PQI chips and was horrible SDRAM,IMHO. They allowed me to replace it with REV 1.5 by paying the difference.
Mushkin does have great CS, but I feel like I overpaid for the same performance.