You don't have to mount it upside down. It works either way.

NOT that I'm an expert. In fact, I just ordered one today. The
FMA CPD4. You can download the manual's at FMA's web site.
Download it and check it out.

I've read so much about it on the forums that I'm getting it
just for peace of mind. I love new and not so new technology.

Heck...I even use a gyro to keep the tail straight.

AND, if you don't like it after you try it...you can easily sell
them here on the forums.

Just my humble opinions....

Oh, and I found RealFlight G3.5 to be fun to play with but
its way to easy.

Happy Hovering...
AB