Yeah - their backings (or whatever they're called) on drawers and bookcases are really flimsy. We purchased an entertainment unit from them a few years ago, and I ditched the cardboard-like backs and nailed a strip of solid wood diagonally across the back. Not as pretty, but you need access through the back anyway and the wood kept the structure much more rigid than was originally designed.

Even the flimsy backings are often structural, since they are the only thing that holds it square. Very annoying when you want to run cabling through.