ive had lots of experience with them. very knowledgeable, very nice and reliable, very pricey. Remember rogers s4 that i believe took best in show or something maybe 1st place in b6 audi at motorstadt 2 years ago. everything he has done was done there. ive had my fairshare of 1st hand experience with them as well and i definitely recommend them, just if money is a big issue then maybe look elsewhere.