Originally Posted by mkoesel
Right but the OP said "the acceleration stops". My car isn't broken in yet so I can't comment on high RPM behavior, but certainly in my experience so far I've never had the car stop accelerating. Like you say, the shift itself happens very fast so there should be no gap in acceleration.
I too have had the acceleration stop as I was trying to shift right at or just below 8400 rpms. I have noticed it only once as I rarely redline my car on the highway. To keep constant acceleration, you must shift around 7500rpms, as someone mentioned previously, to keep the engine from basically stalling out at 8400+ rpms. Despite this one time, I love the M-DCT and would still take it over manual anyday.