My ball vise came in GRS packaging with GRS documentation and at this price point could care less if its a knockoff or not because its a quality knockoff other than a bit of fit and finish work needed from the end user.Excelent value for this type of vise! As others have mentioned mine came with holes in the jaws for attachments that need a bit of cleanup/deburring for attachments to fit well, but honestly this is a quality item that just needs some finishing and TLC to make it perfect.. Why pay hundreds more for someone else to clean/deburr some machined holes for you? You could buy a precision carbide reamer to smooth the holes out to perfection with a hand drill or drill press and still be way ahead of the game price wise. This ball vise operates smoothly and is made from quality materials and is comparable to units costing multiples more once you take care of verry minor issues with it. Consider this a diy item for final fit and finish and you wont be dissapointed. Its rock solid and a great value!