Overall, the stand is easy to assemble. It can be mounted just by screwing the base to the tabletop in almost a C-Clamp like manner, or you can drill into the table. This will depend on how thick your table is. All of the adjustments are made with one of the included Allen wrenches, which you definitely do not want to lose track of. It can be assembled in about half an hour, give or take, and the instructions are fairly well-written, but I did have to refer to the pictures a few times to figure out how to attach things.
It is definitely sturdy once you get it put together. I did have to adjust the arms once the monitors were on to keep them in place (when I initially put the monitors on, the arm kind of drifted down), but once everything is tightened, they stay in place just fine. I absolutely recommend this if you are looking for an inexpensive way to get dual monitors set up.