Yes the X18 is a good racer, In North Carolina, we here have a Superbike Road Racing Class and it is awesome. The fastest I have got my X18 is 56-58mph. Also to quote what someone else said if you don't know how to fix these things you are proubably going to be in trouble.
I mean i dont know hot to fix one but i am going to learn when i get it. So you should need to learn sometime how, like what if it is missing a part or you want to upgrade it then your going to need to fix it. Thanks