Today I just received mine M550 G30 LCI and I was able to drive it like 100 miles.... so far my impressions is that I think I found "the right car".
I was driving my M340 for like year and half and the car was excellent, got full package, the car was beast, the consumption was perfect... but there was still something missing... my old car was CLS 55 AMG v8 so I guess the missing part here was the engine... and today after I drove the M550 I can say it's the right car, like everything in this car just perfectly fits me, the smooth ride on comfort, the perfect v8 sound on sport plus... It just this car is really peace of art.. I can't wait for tomorrow to go around with it and drive it again.
About performance of the car I can say that my m340 was definitely slower but whenever I push hard on sport plus the m340 was just start jumping a bit quicker and rushing, while the m550 is doing it in more smooth way, which I actually like it
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So far very good impression.. love the car <3