Sorry, but... how do you know it's in "good condition"? Does the seller say so? Does a dealer describe it as such?
Never take anything a seller or dealer says at face value. Always go have the vehicle checked over thoroughly by a licensed mechanic. It might cost you $100 (but you have that much since you're buying a used vehicle, right?), and will be worth every penny.
RX-8's are not Mazda's most reliable vehicle, so be very careful before you become sold on the good looks.