i know the roller has the same parts as the kit , if you want to learn how to put together a buggy than i would get the kit thats what i did and i pretty much know what everything is . but it does take a while to put together if its your first time but its pretty easy to build through the diffs and the linkage take the most time to do . if you want to just go out on the track rightway than get the roller but do check over everything espially the cvds in the center espeilly . but u will like the eight it jumps good as hell and its pretty tuff and does boy have steering .