Two weekends ago at a 2-day shotgun school, I had a fellow shooter with one of those new Surefire foreends.
I got to handle (fondle) it, but not shoot it. The owner was one of the fastest, but not the most accurate, shooters in the multi-target, rapid-fire COF's.
The gray color is of dubious significance, but the cross-ribbing and ultra-smooth action apparently produce results. On the other hand, the owner seemed to be a fanatic about point-oiling certain parts of the gun... so maybe all that I was seeing was the result of a good lube job... but he was able to hold on to the foreend and rack it very fast despite the oil.
If it didn't cost more than my entire accessorized and ammoized shotgun, I'd consider buying one. If I had a Benelli.
--Bruce.