I steered my uncle towards buying a 250cc over the Spiderbox just because it already has everything "beefed up" on it, VS. having to modify the Yerf into what a "real" mini buggy should be. (front end and frame mods, shocks, tires, brakes, reverse, etc..)
I think he came out cheaper ($1300) in the long run VS. me with all mods done to my 150 (more than $1300 by now) HOWEVER, he says his Roketa is wider than my Yerf, so he feels mine would run through the trails a bit easier. And mine can fit into the bed of my truck, not sure if his would??? Mine is much lighter than his too, so 1 man loading into the truck bed is quite easy. Once again, not too sure how his would be to try and load up by yourself.
He really likes the idea of having a liquid cooled engine over the air cooled one for summer riding. I haven't had any problems with heat on mine, but I haven't really pushed mine hard on real hot days either. (that's what PWC are for
)