Don't know about the Mini version, but the original Wing Dragon has worked OK as a trainer for at least couple of people on our field. It did break quickly (the middle part of the wing was the first thing to go), but was reinforced pretty harshly, and then served a good trainer for a long time.
The first search for Mini Wing Dragon is an RC Groups link that says it does NOT work well as the first trainer.
http://www.rcgroups.com/forums/showthread.php?t=1515191The original (non-Mini) Wing Dragon is not as good as the current range of recommended first time planes (AXN Floater, SkySurfer, Bixler, HawkSky etc), when it comes initial RC flight training. And I am not sure if the mini version would work any better.
You should reach out to your nearest field, and take things forward from there.