You can use your own transmitter with it, but it comes with it's own controller.

Bear in mind that you'll quickly find G3 a bargain for all of the practice it will give you during otherwise "down" days, and the net savings in broken parts and planes.

You can also progress much more quickly, often skipping many intermediate steps due to the sim.

I went from complete novice (no RC experience, to certified on my second session on a PTS P-51) and my "second" plane was a BiPlane, the third a Funtana 100X.

I skipped a lot of "steps" and developed the "memory muscle" needed thanks in large part to the sim.... however as anyone will tell you a sim does NOT superceed actual field time.... you still need that too.