My buddy's got a 30.06 A-bolt with the boss... he says it definitely works. Considering he hasn't missed anything in the past 5 years, I'll have to believe him.
As for the sound, it's never bothered me with ear plugs even when I'm right on the side of him. Come to think of it, I don't remember experiencing any terrible ringing after we got into a mess of wild hogs a while back (without earplugs), but that could have just been the adrenaline.
Edit: So an answer to your question, yes if you plan on making some really impressive groups. However, if you're planning on just using it for hunting, I'd trust a browning any day without a boss.