Their ad claimed a 10hp gain on a E46 M3 when they cleaned out the MAFS.
I noticed a smoother idle and slightly better acceleration on our E39 530i.
Kragen sells it but I think it was cheaper at Pepboys.
NASIOC, which is a Subaru Impreza/WRX board, gives instructions on using isopropyl alcohol and q-tip.
"For the MAF sensor, use a gentle cleaning action with 100% isopropyl alcohol and a Q-tip. This may be added to the 30K or 60K major service or a week or so after servicing your aftermarket oiled air filter to ensure a clean MAF sensor."
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