Used them for 5 years for Audi - all good. Overall opinion = excellent!
Parts were great quality. Their website has a good distinction between GENUINE/OE/OEM.
Prices are normal.
Returns - all good, did a few of those with no problems. Refunds were prompt.
Customer service is awesome and knowledgeable (Phone or email).
Warranty - miraculous lifetime lol, I don't know how they do it. They said most people don't take advantage of them, so that is nice to hear. I know I sure wont return anything if it served me well...
Every now and then they have email promo coupons...
They really need to expand into FCPJapan / FCPAmerica...