The Aircore's a fun plane to fly... certainly no more challenging than most non-trainers out there... I don't know that it has any -bad- habbits, but they can be lead-sleds.

The Aircore's also a very low-dihedral plane. Ehh.. this can be good or bad. In high crosswind areas it's a good thing. Else it's generally considered an undesireable feature on a trainer.

I'd suggest learning ANYTHING the right way - with an instructor. My uncle builds beautiful planes, and comes home with bags of sticks.

I built a trainer and an ultra stick and come home with both. Not that accidents cant happen....