I have run rear needle sets ups on several airplanes. I set my son Sean's models up that way when he was young to keep his young fingers away from the prop. He REALLY appreciated that!
I have had nothing but good luck with that set up. The biggest draw back I ever had, was that I had to be real generous with the choke and prime when starting them, and sometimes they didn't shut off too cleanly. I learned to try to keep fuel lines as short as possible also. The shut off is cured with angling the back of the tank out a bit. I think it will help you on the occasional inverted landing.
Good luck and have fun,
Dan McEntee