If considering a plane of this size from Hobbyking then the one you should not overlook is the Slick 360:
It's slightly larger than the Edge and it does have a few features that set it apart. The main one being that it has proper aerofoil tail feathers. The Edge along with most of the other HK 3D models of this size has flat plate tail surfaces. In addition to improved flying characteristics the aerofoil tails are much stiffer and stronger. The flat plate tails on previous HK 3D planes have been prone to flutter and breakage, the Slick solves that problem. Also the Slick is really a top quality kit, I can testify to this because I have one. Possibly the Edge is just as good but I cant say for sure as I don't have one.
The other thing is you can be 100% sure that the Slick flies awesome:
Not trying to put you off the Edge, it will probably be great too.