Mine is a little rough once in a while when coming to a stop when the DCT disengages a gear. But is not really bad at all....if yours is loud, really rough, knocking, etc., I would take it in for sure.
Tim (apparently likes "3" cars)
E90 M3 -- Current ride
2004 GT3 -- Sold
1997 M3/4 -- Sold
1995 M3 -- Sold