i did it myself.when i had my Burgman 400 i bought it wrecked and rebuilt it it taught me everything about changing seals,belts,variators sliders,bearings etc etc etc..id rather do it my self that way i know it's been done right i have all kinds of service manuals it's pretty easy if you have the right tools.yup and i never had any lag but i been using sliders for about 5 yrs im sold on them i put a video on the forum that shows the way sliders work compared to rollers you should watch it