Wow, holy old thread resurrection Batman. I remember reading this one a few years ago. Back then I didn’t have anything to say because all my boxes were friction slides so I had nothing really to compare to. Now I do, and I’m home with the flu so, I will say that BB slides are nice but not necessary. They allow for really wide drawers which is nice but, and I think someone said it before, well taken care of industrial friction slides are a pleasure to use and can hold a bunch of weight.
My boxes are Snap-On from the 80’s bolted together. (Bought used, one at a time, off the Snap-On truck in the late 80's when other guys were upgrading to BB)
Here are some examples of a few drawers loaded to the gills.
Chrome Socket Drawer…
Wrench Drawer…
Both slid easily and I never had an issue.
Here is the old with the new (Brother-in-Law upgraded so I got a screaming deal on the 1023) Yes it is nice, and yes it is worth what I paid for it. (less than 20% of list)
Had I not gotten such a good deal I would of happily wrenched-on with my easy to open and close friction boxes.

If I were a new Tech I would buy a set of good older friction boxes and put the rest towards filling them with good tools and have no regrets (and no tool box payment).
Cheers,
Chris