I actually talked to my ca about this on delivery, in Germany. He told me that the ds mode on the gear selector just puts the transmission into sport mode, higher shifting rpms etc. Putting the drive experience button puts the whole car into sports mode, tightens suspension, steering, makes pedals more responsive, and puts the transmission into sport mode. So no benefit to putting car into sports mode and ds mode. He said the ds mode was mostly there in case you needed a little extra engine power for passing or going up a hill. Full sport mode when you wanted to driver more aggressively overall, like curvy mountain roads. My driving experiences have confirmed his statements, I can't tell any difference in transmission function between sport and sport plus ds.