I do have one of these bad boys. It is a SH1T Hot engine. It tunes easily, stays running, and SCREAMS! I had some teething problems with it, but mostly due to my temp gauge giving me false readings. The pullstart..well that's another issue, it's complete CRAP! Mine is currently on the shelf and my Mach is back in the truck until such time as I can get a roto start. Two recent developments are this. Collari is not fitting the engines with a rotostart, but you cannot buy it separately, looks like those of us that bought straight away got screwed again ( The New Sirio .30 is the same block, and same roto start (it ships with this engice as well GGrrrrr!) but you can't get the roto from them as a separate item either (yet).