Minus the rear wing and wheels, I think it looks good already.
The wheels are marginal, some may like it.
How they stay afloat? I can tell you that they have a nice products and quality. I have been selling their exhaust to F15/F16 xDrive50i and G30 M550iX.
And some of their aero components and springs.
Fitment is like a glove. Not OJ's glove though.
Tune wise, it is a good one, but their price point is high since AC Schnitzer in Europe is like Dinan in the US. They warranty your car when you have their parts on the car.