All I have are dial calipers. I am not opposed to owning a nicer set of vernier calipers, but not sure that would get me a lot.
As for your opinion on marrying.... I can't say as I totally disagree, but after 14 years I am still going.
My "Verns" are dial indicator. I like to see at least .001 barrel to bushing. Even then it may tend to get tight if you run the gun real hard......like they are supposed to be ran.