Believe it or not, Hobbico is just now launching a ducted fan jet trainer called the Diablo:

http://www.flyzoneplanes.com/airplanes/hcaa28.html

It flies slowly enough to use it as a primary trainer, but can be upgraded with a sport wing and a double fan power module to increase the performance level once you're comfortable with the basic flight performance.

It's an interesting concept, I certainly hope Hobbico executed the idea well enough.