thanks, they seem quite cheap...are they worth it?
They aren't going to change the way your car goes (unless you're old plugs are knackered), but iridium plugs:
> have harder tips,
> last longer,
> perform better overall across their life,
> demand less voltage draw than conventional plugs (easier on your coil packs)
> produce a better burn (less deposits / unburned fuel)
If you think about it, in raw terms what does a car need to go? Air, fuel and a spark. Personally I rate NGK's as the best of the mainstream sparkers, and worthy money if you've been tinkering elsewhere. Everything feels a little more complete.