Its likely you have the software update to minimise this. As I had an early car, I had this badly until they updated the DCT software. Essentially in certain circumstances, say approaching a junction, you'd be in D2 and hit the throttle and absolutely nothing would happen, for say 2-3 seconds, which if you're coasting out of a junction into oncoming traffic and expecting acceleration, feels like a very long time. During this time the DCT was going, er.. I'm too low on revs for D2, should I go D1, er... then eventually it would work it out and off you'd go. Newer software forces D1 early. Hence people feeling a clunk as there are still revs when D1 is engaged. This was BMWs workaround. I still get this from time to time, but it has to be a very specific set of circumstances, cool engine, low revs, rolling slowly, in D2 etc etc. Sport mode or manual gear selection avoids the issue as the revs are held higher in the gears. Many people may never notice it due to their driving patterns.