They are just cleaner than your average sport plane. It is easiest to land them dead stick, as they glide a long way. The Quickie style planes are easier to land than the Zoomer or Napier (a little more drag). The biggest problem people have landing them is overshooting the runway. The quickies are nearly impossible to stall, you could stall the zoomer or napier, but really they are not any worse than your average warbird.

As to differences between the two quickie kits. Mine (Seeker) is an all wood fuse, Kevin's (Mad Dog) has a fiberglass fuse. Both are good flying planes, the only real difference other than the fuses is the airfoils.