I am always skeptical of the manufactures videos of something working. However this one is as good as advertised or better.I bought it as we were knocking a hole in a poured concrete wall. It strapped on easily and just pulls the dusts in. I was simply amazed at how well it worked. We had it hooked to the vac and couldn't smell the concrete in the air, no gray funk in the tissue after working inside or in the shower that night.Only thing is that the case it comes in (a very convenient case) has labels for which shims goes with which dewalt hammer and they had teh wrong size listed for my hammer. The dust collector wouldn't tighten at all the way it recommended. So i used a thicker one that came with it and it worked like perfectly.I highly recommend this dust 'extractor'.