mkbtuning

I just found www.mkb-tuning.de on www.driftworks.com from another W202 owner, some of the stuff they have for even a C180 looks pretty good, cams n stuff to go to 141 bhp, stroker to 2.5L from a 1.8 etc... and it al seems realy good. Thing is has anyone actually used them? Id like to know what...