Does what it says..... - SureFire Warden Blast Regulator

I Shot this on three different setups, bolt gun in 308 18" barrel, AR w/14.5" 556, and an AR w/11.5" 556. Bought it for fun and to be nicer to my range neighbors, and really out of curiosity. I definitely see the practicality of this device, but it has some issues. With the 308 bolt gun at 100' yds I experienced 2.25"-2.5" inch zero shift. With the 14.5" 556 I got similar results @ 100 yds, but with the 11.5" @36 yds, the shift was hardly noticeable. Less then half an inch. Now, I got definite directional control of the blast, it was very linear and forward, and the matter of dust kick up was not possible for me to test do to being in an indoor range however, needless to say, the dust kicking up should not be an issue with this device as the blast was certainly pushed forward. The zero shift is a problem though, and I will have to do some more testing to see if there is any consistency to it, if it is predictable and, if it is something that can be worked around. Side note, recoil does change, not a problem with the 556's but with the 308 it was more noticeable and if you want to see your hits at longer ranges, or get fast follow up shots, you will have to work on settling the rifle back down, which negates the reason for having a break on it in the first place.