Love the shelving unit, but it took forever to get it put together.  It's quite the assembly project.  A lot of the screws just did not want to go in, even with the power drill.  The pre-drilled holes weren't large enough for the screws that were included in the hardware package. I ended up having to re-drill most of the holes in order to get the screws to fit.  Love the finished product, but it was quite the ordeal to get to that point.