Don't get the generation that doesn't let the drawers fully extend; whichever generation that is. I was in the store one day and they had two 56 inch boxes side by side. One box would let you pull the drawers all the way out while other box sitting next to it wouldn't.
I have the one that doesn't let the drawers fully extend, I am not sure what model number it is, but it is the one people refer to as the inferior model.
That said, it never really poses a problem for me. It's only like 1-2" at the very rear, where I keep all my long breaker bars anyway.