Very high quality construction with a precision switch for left and right, 6 levels of power, and very powerful in operation. The only disadvantage is their weight (about 2.5 kilograms), which is quite significant if you need to hold it in strange positions for a long time. It also comes in a cardboard packaging and I would prefer at least a simple plastic hard case. However, for the money, it comes very close to professional ones. I recommend it!