Have to disagree with the statements about the B&M. I've had one for 2 years and 20K miles -- and it has been rock solid.
A number of people who have bitched about them either haven't installed them right:
-- red Loctite, what's that?
-- RTV sealent? I used Shoe Goo instead...
or drive like morons:
-- this B&M's a piece of junk, I snapped the shifter off in my hand after 10,000 miles -- when I snapped the handle off the Hurst in my Trans Am, it took me 20,000 miles to do it
While I like the four bolt mounting of the GMM and other aspects of its design, I don't think it's worth the premium after driving both -- especially if you know how to read directions and install the B&M right. Not trying to pick a fight with anyone here -- as there's nothing wrong with the GMM at all -- I'm just getting tired of people bashing the B&M.