Decent quality. But most tutorials shows backlash nut assembly wrong, and backlash springs are weak. Spindle is rubish, but that can be expected. After some tweaks works good for engraving or some plexi/wood milling.
Tip: you will need to clean and then lubricate the linear bearings. Do this prior to assembling the machine. There are Youtube videos describing how this can be done. Consider if you want to add endstop switches, - and drill holes for mounting these. Do consider if you will need a beefier spindle motor.