I actually use to own a Kyosho Inferno MP-7.5 which I sold on ebay recently because I just wasn't using it anymore. I got bored of having to constantly re-adjust the engine and how messy it was in general.
But when you get them running sweet and you have the time they are a blast! Enjoy man!
BTW, if you bought it new and you don't already know make sure you run-in the engine properly as stated in the manual because if you don't the engine will not last a year! Also, be sure to change the glow plug before it dies completely to keep the engine running sweet and to reduce the amount of engine adjusting you do.