It depends on the type of person you are. In terms of maintainance cost yes the 6 speed will be less ultimately, but driving pleasure...is a different story. I now own a 03 M3 Vert SMG but before I ended up getting it I was stuck deciding.
The first week I got my M3, I was wondering if this is the right choice. Now few months later I have no regrets. Would I still prefer a manual? In some situations yes, in most it doesn't make a difference to me. Shifting comfort is good as long as you pick the right program for your driving style although I feel in stop and go traffic I could probably have a more comfortable ride using a traditional manual transmission. IMO When it comes to performance driving, the average driver will definitely benefit from SMG.
The cost sometimes may be a bit high depending on what the problem is but in the end it's a fun driving experience.
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