I've been in contact with Racing Beat on several occasions, and the head engineer was apparantly involved with my testing of other bushings although I never talked to them directly.
One possible failure does not mean total failure. Lets see what happens to other people over time. I have more then 3000kms on far worse road conditions ( I would bet me life on it that my roads are worse, and mine aren't freeway...all town and city driving which is far worse), and so far so good, and my bar is not new.
Winter is the worse time for the clunk. My MP3 would last 2-3 days max on other bushings driving over my winter roads. If I can get since Nov to now, on these, I could go all summer with these.
anyways...as usual, keep driving, and keep updating.