After some time playing with the printer, I'm happy with it. Overall quality is good. I own an original Ultimaker 2+, so I can compare both machines. Panels of the frame are almost the same quality, plates and accesories are pretty good too. They provide extra bolts, and tools are included, great! Assembly is quite straight, just follow the videos they send tou you (chinese) and it's done in a few hours. Main diferences with genuine UM2 are a sturdier Z platform (2 beams are added), an all metal extruder, that works well, the pulleys with two bolts for thigthen instead of one, and the hotend. The power adaptor is instaled below the chasis. Quite noisy when the fan is on. The hotend is preassembled and had some leak issues, as you can notice in the picture. I had to tight the seal between the olsson block and the heat break. Max. retraction value for this hotend is around 4mm, or you will suffer underextrusion problems due to blockage.
Fast shipping and good parts, some better than the original um2 like the metal filament feeder. Only the trapezoidal nut was plastic instead of brass but can be replaced for €3.