I purchased these shelves in a set of two and attached them one atop the other with the included brackets.  The hardware was fine and the shelves attached fairly solidly to each other.  The shelves look good, with a lightly varnished finish.  They aren't the sturdiest shelves,and I'm careful to put lighter stuff on the higher shelves, as I can see that they'll tilt or sway if not treated with care. My uneven floor is surely to blame for some of that slight swaying I've already detected, but I have placed shims under the bookcase and used a level to straighten it out.   I think that the single unit is probably a better bet, as it doesn't have some much sway-ability with a lower center of gravity.  Still, for the price, it's a great buy, and it organizes books and knicknacks very well.