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From a driver's point of view, the flat bottom wheel is useless. I went from a 2014 with a round wheel to a 2017 with the flat bottom wheel. Now granted I only have 164 miles on the 2017, yet already noticed the void when rapidly turning the steering wheel just parking the car. I can live with it, certainly would not purchase if it was an option. Cosmetic improvement?
Already noticed the same thing, and I only have just over 300 miles on my new GS. I think it looks cool, though, which is probably the main intent.
Like everyone else, I agree that the flat bottom steering wheel helps with sliding in and out of the car. That's a fact because if I have the wheel turned the wrong way, my leg/thigh will hit the steering wheel when I come back into the car and I curse at myself for not straightening out the wheel before I exited lol.
The flat bottom is a joke for your hands/grip. The only time I think it would be useful is if the bottom is completely empty (like in the Merc S500/550). Then you can position your palm anywhere you want without having the divider tell you where to put your hand. In all honesty, I really miss the round wheel where you can actually make fast turns and not lose grip. I just can't seem to master turning the wheel either direction very fast AND still maintain a solid grip on it.