Yes, used their product on one of my 400's..front to back..about 8-10 years ago. Holding up nicely so far. And since it was a fraction of the dealer, I figured, as you probably have, that if it went bad I'd just replace it again... and still be ahead money. That being said, I fortunately, haven't had to use the product since, so I can't speak for today's quality.

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'89 260e (212K Mi.), '92 400e (208K Mi.), '92 400e (not a misprint) (146K Mi.), '95 C220, '81 240D--Sold