It took about 3 hours to assemble.  The instructions were not complete, as for example, it did not address adding the rails to the drawers.  Also, in the instructions it says not to use a power screwdriver, but except for one or two areas, this could have cut down assembly time by at least an hour.
As for the quality of the unit itself, I like it.  It is nice having sliding rails rather than the old wood on wood type.