I have one on my Winchester. I didn't like the muzzle blast so I called Winchester and they sent me the CR (conventional recoil) muzzle weight.....no charge. It's been on the gun ever since. As far as helping accuracy, I cant really say. If I had to do it over again, I'd leave it off. That's my opinion, YMMV. It will be interesting to see some other opinions.
Browning White Gold Medallion .30-06 w/BOSS. Love it. Recoil reduction is significant. The BOSS is supposed to enhance accuracy. Don't know one way or the other, but I do know my rifle is very accurate (but not necessarily more so than a Rem 700, e.g.). Do some searching here and you'll find some more replies/reviews about the BOSS and other muzzle breaks.
If you're lucky enough to be on private land and can leave your stand up during the off season you can tie an old piece of cloth or something of the sort to your stand. I like to use an old camo bandana that I have. That way the deer get used to the movement and eventually don't bother even looking up when there is slight movement. This may just give you the time to draw your bow or raise your gun without being detected.