If you run only x1 make of saw all is good and your chain sizes are all consistent.   If you run different makes - then it becomes something of a pain! You'll never get the same guidebars to fit across different saws . But you could get them all running the same size chain.   Now that Stihl are making 3 or 4 chains in .325 .050 I wonder if anyone has switched all their small/mid range saws to .325 .050 chain?