Build quality is extremely good. It was fairly easy to assemble, a few stages made me stop and think, but everything was intuitive and fit together nicely. Instructions are brief. Extremely easy to follow after I assembled the machine, but I was baffled briefly a couple of times. Videos on the website moved so quickly that it was impossible for me to follow. They also had no narration or any explanation of the steps. Again, easy to understand AFTER you have done it once.
It's very easy to engrave things on the first try. The software provides tests to find tune settings. Cutting was better than I expected for a moderately power laser.
I am extremely happy with the machine and it's gotten quite a bit of use so far.
I have had to move the device a couple of times and the frame is very rigid and everything stays square. It's a really nice tool.