Anyone using the jtek shiftmate? Why is it so abhorrently expensive for what it is, are there any aftermarket options?

For the uninformed, this pulley system changes the cable pull ratio to allow cross-compatibility between shifters, derailleurs, and cassettes. This thread is also aimed at those who run different components and have yet to resolve their shifting woes.

Handy chart detailing pull ratios and cog pitch: http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/