No complaints about shifting smoothness it’s just that reverse gear shift when eco engages and it does generally engage when I stop to shift into reverse as I back my cars into my garage. The 2wd e450 cabriolet does it a lot worse than my awd wagon. This being the only real complaint I have with the car though is not bad as everything else about both my 450s I could not be more happy with. I’ll mention it next time I’m in for service. They probably will just tell me it’s normal though. With the cabriolet though I may be able to turn off eco with the tune when OE comes out with a handheld for this car and that will take care of that issue.