I had my transmission replaced under warranty last week. While doing the swap, My tech put in a brand new B&M ripper shifter, which bolted up fine and dandy. I get a call from him a couple hours later telling me the tranny is bolted up to the car but the shifter won't shift into the forward gears. I immediately head down to the shop to find that the shifter is in a wierd position, and will only shift into 2nd, 4th, and 6th. I initially figgure that the tech must've bolted the shifter on incorrectly.. well he pulls the shifter out and we practice bolting it onto the old tranny he just pulled. Well, It bolts up fine but the same problem with the shift pattern. It turns out the geniuses at B&M assembly plant put this thing together backwards. We had to dissasemble the shifter, turn the shift lever 180 degrees and reassemble. Earlier when i called B&M tech support, their answer was "sorry never heard of that problem". Very lame! Poor QC cost me an extra couple hundred bucks.
For the normal joe who adds a ripper shifter, this wouldn't affect you as bad since you'd install from the top of the car, but in my case, it was ugly because we were installing it already mounted on the new transmission.