Had a couple A bolts and liked them really well, one had a boss one didn't. I personally didn't like the boss system very well. The boss gun was very loud and didn't shoot as well as the gun without the boss but the recoil was greatly diminished. If you want a brake I would have a good gunsmith install a traditional non-adjustable brake but like others have stated I don't think the noise trade-off is anywhere near worth it on a 30-06.
All that being said about the A bolts, if I were going for a new Browning I would try the X-bolt. I have not shot one but I like the way they feel compared to the A bolt and I have heard good things about them. I am actually toying with the idea of a 300 WSM
X bolt stainless stalker for the upcoming deer season.