I started with the hyper SS .21 buggy, its fine on grass, gravel, dirt even Tarmac lol but I also got fed up of messing with the carb settings every time I got it out for a play. The noise & smell soon put me off too so now I have a hyper 7 with brushless conversion, no mess no adjusting every time just charge a couple of lipo's and its good for 40+ mins
The big plus for me & my lads is you really can run it anywhere
I do have a second brushless roller that I'm still trying to decide what to do with lol
Rob