The build process took me about 5 or 6 hours on a Saturday. I am fairly mechanically inclined, and the picture instructions were enough to get by. The aluminum sliders are of high grade and the once the printer is assembled it is a pretty stable machine.
I had some issues which assembling the printer but most of them was because they were vague. Most of the issues happened with the wiring of the controller board. Assembling is easy but like any other 3d printer the tough part is the calibration. Once you overcome this it would be smooth sailing for you.
Overall, I think it's a good first printer, I enjoyed building it and working on it. They could have worked harder on the assembly manual and it would turn to be a great purchase experience.