well, for $7each I might throw a set in next time. give'm 60K of use. It's actually cheaper in the long run. But I wonder if they really last 60K. I've tried Bosch platinum plugs before in my Vette & supra and HATED them. my vette had this "mystery starting problem". Very hard starting.. sometimes had to crank it 5 times to get it going. Buddy of mine told me it was the Bosch plugs and to try NGK V grooves or regulars and i did. never had the starting problem again. Only thing that changed was the plugs. So I've already been bitten by expensive plugs before.. that's why i'm weary now about iridiums.