I run an IS-F, it's just had its 60k service, Lexus wanted £895 for it, my brother in laws best friend is a mechanic, who does all ford, bmw and other main dealers cars that they can't do, but the unaware customer is paying main dealer prices for, my F has just cost me £450 and YES all 8 plugs done, at the end of the day it's a stamp, BUT me personally I'd rather know that what's been done has been done, not paid for and skipped over, wether the next owner believes me or not, maybe an issue, that bridge will be crossed when that time comes, BUT for me, I know it's been done properly and by someone I trust FULLY