Has anyone actually checked weights of the pistons to see how close the shop has actually balanced them to "0" ? ....or whatever the shop claimes ?

A Bud of mine checked a well-known shop in the Detroit area ..... they claimed they balanced to 2 tenths. He weighed the pistons and some were off by almost 5 grams.

But some people claim that with all the oil flying around and on the rotating-assembly ....up to 10 grams off really does not matter.