I have not used one personally but I would have a hard time believing all of their claims without giving one a thorough workout. Drawing on a tom or buck typically involves movement with more than just the bow arm. That movement would be transferred right into the blind. Bush-looking or not, that movement is going to catch game's attention and potentially spook it.

As for it acting as a noise and vibration reduction device....it is lightweight and just an attachment to allow the umbrella section to open up then I don't see how it could do it. If the handle had some Sims Navcom material installed inside of it or was free floating like a doinker then maybe but without either of those I would be hard pressed to believe noise and vibration reduction.

Sorry for being the pessimist but they are just my thoughts.