its cheaper for u cause the shipping is lower where u live. the mmm is 140 free shipping here in the states. i paid 130 shipped for the xerun 150 cause i had to have sensored and i smoked my mmp. took 3 weeks for castle to send me a new one. so far the xerun has been holding up fine with about 2 dozen runs so far although it doesn't seem to have as much brakes as the mmp did.which software version do u use? is v1.6 the only one? is it better to use speedpassion software?