That's a good habit to get in to. However, interpreting the results depends on your hardware. If you've got a really crap graphics card for example, 250fps means pretty much all machines will be able to run your game with a nice overhead above V-sync rate. If you've got nVidia's latest $500 graphics card with 500 shader cores, that's equivalent to ordinary video cards choking to death, but your card is so obscenely powerful it can still pump out 250fps. (these cards can often get 10,000fps+ with simple games on unlimited framerate, which is pretty amazing)
As for families, are there any bugs on the tracker about it? Have you been able to reproduce issues in a new .cap?