The biggest disadvantage to that particular box is the depth of the top drawers. Note that the front edge of the top chest sits in quite a bit from the front edge of the bottom cabinet. They make top chests that sit essentially flush with the front of the bottom, adding a couple of inches to the storage space in each of the top drawers - important when storing long things like screw drivers and pry bars, and just plain handy for the space.
As for the tool boxes with and without ball bearings - the reality is that it doesn't make that much difference. I have two Craftsman roll around tool boxes - an older one with the short top drawers (and a center add-on stack) and a newer ball bearing box. Yes, the ball bearing drawers are nice, but I'm not sure I'd pay extra for it. I did pay extra for the deeper length drawers. I keep most of my tools in the new box, and still have plenty of less used tools in the old box.
The biggest thing to look for is lots of deep (not to be confused with height) drawers. The more drawers, the more you can organize your tools. Remember, you want lots of square inches of storage space, not cubic inches of storage space. Square inches let you spread things out, cubic inches means you have to stack things in the drawers.
Pay extra for more tool box than you need, you will need more later (that's why I have two boxes). The center add-on boxes take up extra space that could be another drawer, and actually make the whole thing too tall - it's harder to use the top for anything more than just a place to toss things "for later".
