My brother and I both run the Conti DWs on our M cars; my 335i has the PS2s so I have an honest opinion about both tires. The DWs may be a tad louder and they aren't run-flat (a good thing). The PS2s feel nervous in the rain and they don't seem to last as long. Needless to say, as soon as the 245/35/19 DWs are back in stock I'll be switching the 335 over to them.
2008 ///M Coupe