stubble, we would all like "better tolerances" in our dies. Question; how does that work out in application?
In my experience, what we pay for with expensive dies is pretty exteriors, not greater precision. Weatherby marketed some very pretty dies, but not enough of them to keep it up so they didn't last long in the market.
Only thing not covered was the tolerances and wear of the reamers used for both the dies and the chambers of the guns to which they pertain. As reamers are used they wear, they're sharpened and used until the tolerances are exceed, then they are replaced by larger ones made especially to allow several sharpenings, and this applies to both the rifle makers and the die makers.
I completely agree with all of boomtube's points, and he emphasizes my point.
A cheap, ugly die, if it mates well with a rifle chamber, can be much better in any given application and it's just luck of the draw as to how well it matches your gun.