I posted negatively about a product a couple times and took verbal beatings for a week each time (not legitimate arguments, but personal attacks). It appears that most wlll defend their equipment as if it were their child or their own company. I quickly learned to keep manufacturers names out of posts unless you have something good to say about them, or are looking for a good fight. I think many have experienced the same. Unfortunately, this makes for a much worse forum for truely finding out about a product. You'll hear a lot of praise, but many of the ones who disagree will keep quiet.

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As for the irregular vibration problem, do you have a quiver on the bow? If so, maybe an arrow is loose, but only when in a particular spot. One thing I do with all my bows is to put a layer of moleskin anywhere an accessory is attached to the bow. I eliminate any metal to metal contact and it helps greatly with vibration. I also put a medium threadlock on any bolt that I'm not likely to want to adjust or move.