Nope not tried them myself, i stuck with the ngk's cheap and cheerfull

change them more often

i have replaced leads, plugs, dizzy cap and rotor arm oh and that damn fiddly pain in the a##e o ring on the cap, i know why mine was missing now

rotor arm n cap made the biggest diff on mine, my cap wasn't that bad the rotor arm was duff

but i got a spare cap now

I hate losing of the lights to a sprinter so let me know if they make a difference
Dar