I just got my guardian today and have been shooting it for hours. You have nothing to worry about, the shock and vibration is next to none if any. Its VERY quiet too. One complaint I do have about it right now though is the strings are in my line of sight with my sights covering about a quarter or so of the sight. Not blocking the pin but in the sight. I am trying to find a solution to the problem and contacted bowtech. The shop I bought it from said they dont know what to do about it, its the design of the bow but I have a hard time believing this.