I am going to stick my 2 cents in here.

The Aircore is ok as a trainer because it is pretty rugged, but it is a BRICK. It is heavy compared to other trainers out there. For a trainer, you want a high wing plane with dihedral. The plane, ideally, should be a flat bottom airfoil and have a wingspan of ABOUT 60" - 70" (40 size trainer). The TOTAL WEIGHT (ready to fly, less fuel) should be ABOUT 5 1/2 lbs (40 size trainer).

Much lighter than that and the plane MAY have difficulty with wind. Much heavier than that and the plane WILL have a minimal glide factor (In laymans terms - the glide factor of a rock).

The SIG LT-40 is an excellent trainer. There are several others that are excellent also - Hobbico SuperStar, Tower 40 trainer, Thunder Tiger trainer, etc.

With VERY FEW EXCEPTIONS, trainers fly pretty much the same.