KW adjustable spring kit - new out


A4 Avant B9 2.0 Tdi
So been doing a bit of research into modding the new motor and came across these while out here in Germany after seeing a B8 at my local Audi dealer, not sure if they will be any good but had some KW's on my B7 and couldn't fault them. It's just whether I take the plunge and risk the warranty. Also thinking a set of Rotiform IND T's.
Being in Germany they work out a lot cheaper as I'll get them tax free.

What are people's thoughts.