There are other advantages of the SUPLEX units; besides all the advantages of being sophisticated monotube adjustables rather than 'run of the mill' bleed hole controlled twin tube adjustables: 1. The SUPLEX units have a rising spring rate to give good ride yet good control of bump deflections. SPAX have cheaper less effective linear springs. 2. Both front and rear SUPLEX units have internal rebound springs, SPAX don't. At the front these significantly increase roll resistance thus reduce roll even with a soft initial spring rate for good ride. At the rear the rebound springs limit the lift of the rear of the car when the rear wheel comes out of a pothole.
The M3W drives like a sports car should with the SUPLEX units, after all it has the performance to match.
Yes there is far more engineering and development in the SUPLEX units with progressive/rising spring rates and damping ratios developed specifically for the M3W.
But as always you pays your money and takes your choice.
