As a professional user with 50 years experience in metal and precision mecanics manufacturing I consider the following:
First the price. For what the product offers its a absolute bargain. Unbeatable after extensive comparing all mills offered as well comments form other sales sites. Obviously its a chinese product and cosmetics are not top. The steel of the rollers on its surface is of good hardness for non ferrous metals processing as indicated and promisses long lifetime for this purpose and use. The operation is simple as well mounting the equipment. Quiet heavy, and therefore sturdy. Some improvements realized with the roller T-handle where some excessive play was fixed with a washer as well 10mm selflocking nut , adjusting it to better tightness an smoother operation. All standard Philips style screws where exchanged with harder hexagon Allen key screws, some much longer than original ones so to improve maximum hold checking the maximum permitable length . Particulary the cranking handle screw should be replaced for a longer one, this helps to avoid problems of eventual problems of harder use . The gearbox cover is plastic but doesnt affect operation or security. The cover screws also should be replaced for allen key type screws.
Resume: This equipment is absolute usable for comercial use doing some adjustments as indicated and for hobby users it should last forever. In any case I would buy it again because it does the job. As for any machinery one should know how it works and principle understanding of operations are realized with it. As well the aditional time and hardware spent used to "customize" the roller mill is small for what you get in return afterwards. A funcional good tool for little price and final results counts. Finally clue: Vevor had the best offer for the same machine which was offered in other sales site and specialized shops. Some diferences mounted to a hefty 300% more.