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Horsepower TV last week had a piece they did about upgrading a 5.7 Hemi Charger cop car, and they used those plugs. I reviewed the piece last night, and they claimed an 8hp gain in "previous tests."
Now, I don't believe everything I see on these shows, because I know they do their sponsors' bidding, and I didn't see the section where they tested these plugs, but I do remember seeing other shows where they tested inexpensive power adders like synthetic oils and plugs, and verified the results on the dyno... and while dynos may not lie, they certainly differ in the way they report performance...
As for me, I'm still using NGKs, and waiting to see if MSD will come out with a system for our dual-plug Hemis...