Has anyone actually owned both the Z4 Alpina Roadster S and the 3.0si? Looking for a real world view from an owner or someone with extensive experience with both. Handling, performance, brakes. Steering. Noticed no sport button. Is the steering therefore always in heavy mode like an engaged 3.0si perhaps? Throttle response aggressive too? Pros and cons etc. Hoping its a substantial upgrade. Not a fan of the Z4M. Twitchy, steering, and its various quirks and double maintenance costs s the 3.0 si.

