the "advantage" to the two speed for me was quicker take off without losing top end speed....you get a bigger spur gear for 'first" gear, to get you moving faster, thenit changes to high gear for your all out speed runs....seems to be as fast if not faster than before,a nd quicker to that point...the cost was 85 bucks for the kit to convert my trans to two speed...it does indeed eliminate the center diff, and to me and the place/way i run my buggie it is beneficial because the buggie was prone to picking up one fron tire in the front during long sweeping turns and that caused all the power to go to that tirre...instead of playing around with diff oils i just did the two speed which "fixed" two problems i had....it was a win/win situation for me......