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the SMG's are single-clutch manual six speeds with hydraulic actuators working the forks and a computer controlling the whole shebang. Literally a normal manual 6 speed with electronics working all the fun bits. Not the same as a normal BMW steptronic or old Porsche tiptronic, which is a plentary hydraulic torque converter-driven automatic that has user-selectable valves (gears), nor is it the same as a Porsche dual-clutch (PDK), which is far far quicker shifting.
Not heard of any problems with the SMG. I'm sure some like it, but really I don't see the purpose. I do not think it can shift faster than a normal person shifting the same 6 speed. It's a bit more efficient than a slushbox automatic, I guess, for those who don't want the third pedal.
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