I am thinking that my M will last a while, it's built well. Only knock on it is the SMG. Well, when that goes, it'd make sense to go with something better. The DCT will be nice, actually I think it may just make the E60 M the perfect 4-door sedan.I have heard that Karl Otto Noelle has been doing some prototype DCT's in E60 M5's. You might want to call Dinan to see if this is something they could do for you.
The shifts are going to be much much smoother and just as lightening fast. YouHow is DCT better than SMG?
My SMG shifts lightening fast....even though the car is impossible to drive in "D" mode (I'm always shifting gears)