I still can't replicate it, Gink.
I remember the day I was testing the device before I left the store (my habit after purchase, to use it for a bit after some configuration here and there prior to walking out with it) I found the little buzz to be weak or not there at all if I went too fast on the soft keys.
So I slowed down just a bit and as I say, no issue. I tested that a few more times over the days of first having the Fascinate. The pause is only about a full second between back to back movements coming out of the browser, for example.
It sounds like you have a different issue, and those who are advising you to have it looked at are right, if it's a deal breaker for you.