I have 7.5k+ miles and have driven the auto-stick like it was made / advertised for. I wouldn't say I push it quite as hard as some others have posted. The tranny does indeed learn too, even in auto mode mine downshifts a bit early when slowing down, just as it would if I was running it manually.

The thing is a tried and true MB design which should (I expect) hold up for many, many years.