Response and update
No, have not dynoed car, seat of pants evaluations only.
Low end torque much improved, feels like small V8.
No changes in suspension, have sports package, make no pretenses - it is not an M3 there.
Warranty: dealer will not warranty any parts/systems supercharger related or affected, at their discretion. However, one can purchase an extended warranty for about us$2500 for which BMW will warranty all (except SC itself) for life of factory warranty.
Finally got ECU back from ESS and, like they said it would, it runs even stronger especially at 4000+ rpm. It just leaps into the redline.