I really hate the idea of companies sending everything in pieces, for the consumer to put together. I especially hate it when I don't read the comments beforehand. Given that I had no room in my office for the books that I refer to often, I ordered a couple of metal bookcases to replace a couple of the small pieces of furniture that I had been using as bookcases. Looking at the pictures on Amazon.com, it looked like it would go together like erector set pieces and since the shelf details stated that it was capable of holding up to 750 pounds, I figured they'd be rigid pieces of metal. I was wrong on both counts. Although the process of assembly is that of an erector set, these shelves are made unnecessarily difficult. Being able to hold the pieces of metal in place so that the holes line up, while simultaneously screwing the nuts into the screws is very difficult. Nearly all the comments indicated this, but I didn't read them. One person headed his comment with, "This is the Second Worst Thing That's Happened to Me Since My Grandmother Died." There were far more one-star ratings than all of the others put together, and most of them had to do with the difficulty of assembly. The other problem is related. If this thing is capable of holding up to 750 pounds, this is on the basis of more physics than I could muster because the shelves are very flimsy. Since the corners of the shelves aren't rigid enough to maintain their form, I have to hold the corners of the shelves together in order to fit the screws in with one hand, place the nut on with a second hand, hold the nut in place with a third hand holding a needle nose pliers, then tighten it all up with my fourth hand, all the while my knees are hurting from the hardwood floor. My wife wants me to send it back, but I kind of want to together so that I can begin the process of putting my room back together without having to wait for another kind of shelf. I don't have a lot of patience with assembly to begin with, and this seems to be the worst kind of it. Had they simply sent me erector set pieces, only bigger, I wouldn't need instructions or four hands.