i have a B&M shifter..i think it works farely nicely...i dont know what should be the problem though ..i had a little rattling noise from it in the beginning...but it went away..fitting is very easy...and the quality of the actuall gear shifter is smoooth.nice chunk of nice machined alloy!!
i dont know if there are shifters that are even shorter leverage.that might be the negative side of the b&m...if they are actually longer movement than the other makes....