Problem is.... MOST of us dont have balancing equipment
so your going to end up taking someones word on it...
so who do you trust the most... like Leon said a good
shop will put some time into it(but it cost)... I
like to turn them down then add a bit of weight closer
into the mains(pressed in fore and aft in the counters
so they dont just spit it out)... I prefer a local
shop
EDIT
I have a local shop that I happen to like and he
does some nice work for me