Help! Lowering kit for X3/X4.

I have found three suppliers of lowering kit for X3/X4. With the kit X4 looks RIGHT - not a coupe on stilts.



It is the same springs X3-X4.



Nobody in the X4 community has any experience.



Anybody here that have experience of 35 mm (1 3/8") lowering?



Comfort?

Performance?

Riding on the bumpstops?