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After spending some time to thoroughly check this I can tell you that mine does not do what you describe - not at all. It maintains the speed smoothly in every gear between 1200 and 2000 rpm, both in normal and sport modes. I was only able to make it hesitate (buck a bit) when pulling from 800 rpm in 6th gear. In the process I also noticed how instantaneous the power delivery is with no turbo lag whatsoever. My X5 35d exhibits a touch of turbo lag here and there but my 550i . . nothing that I could detect.
When I was shopping for my car I test drove a 2011 550i 6 speed manual and I noticed a hesitation when taking off from a stop. It felt like the brakes were on for an instant and then it would release - it wasn't the hill hold feature and I never got a good response for the cause of that. Fortunately, my car didn't show it when it arrived. It sounds like your car indeed has a problem and I can only wish you luck in your dealings with the "techs" at your BMW dealer.
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