Denso IWM spark plugs-anybody tried them?

[elacruze]

I ordered a single Denso IWM24 plug because it appears to be the shortest 3/4" reach plug around...but not cheap at $11 each. My #1 cylinder has no plug boot clearance on my Hooker Super Comp 2" headers-all the other cylinders are great. I'll give this a shot and see how the heat range works.
Anybody seen these up close?
http://www.globaldenso.com/en/products/aftermarket/plug/power/lineup.html

[A383Wing]

I have seen them in small block Chevy motors...seems to work well

When I had headers on the black 66 back in the 80's...what I had to do on 3 cylinders was take the plug boot off so it would not arc through the boot to the header

[frederick]

I've tried the NGK iridium and noticed it's more tolerant on mixture quality and got slightly improved mpg.
The don't last long in carburetted engines however; I got 2500 miles out of them.
Switched back to normal copper plugs because of that.