Great product, only one reason for 4 stars. I wasn't real impressed with the roller. It does work but with limitation. This would've been perfectly paired with a chuck roller. As far as the laser machine, it has exceeded my expectations. This 20w at 100% is enough to permanently mark weldable metal with great detail. Assembly and setup wasn't a hard. Most difficult part was feeding the tracks evenly. As always can't beat Vevor. I would recommend this product and I can't wait to save up for the fiber laser.