They are the most quiet M/Ts I've driven so far. They sound more like an XT or an aggressive AT. There's a bit more "drift" than the previous tires, but That probably has more to do with them being two sizes larger.
As for price, it's hard to make a comparison in USD$. I got them for CAD$1250 all-in, including taxes, mounting, balancing.
That works out to being about $50 per tire cheaper than the BFGs