we have a whammy-jammy Hunter GSP9000 balancer, and it does matchmounts as it balances... eliminated 90+ % of all the tires we had to send back for ride disturbance complaints...
I know no-one likes weights (even the nylon coated ones) on the outside lip of the wheel, but it's a LOT easier for us tire guys to keep you rolling down the road without shaking the fizz out of your Pepsi... one guy that comes into our place has these things called "Balance Masters" on the hubs of his Dodge... some kind of lead shot or sand in a viscous fluid; supposed to not even need wheelweights (those bead-type things, like Equal, tear the living HECK out of a tire liner)... we did the matchmount & two-plane balance gig on his new Silent Armors, left the Balance Masters on, and he came back an hour later and damn near kissed us, it rode so smooth...
Oh, by the way... tires need to be RE-balanced because they walk around the wheel... if you don't belive me, make a chalk mark on your wheel and on the sidewall... at the next rotation cycle, the marks will be separated... our new bead construction helps lessen this...