So, I've just recently got the HC3 and so far its been a bit of a battle to get it working any where close to the HC2.
Out of the box, the setup script didn't work and it took a couple of iterations before I got through it.
In no particular order here's some of the issues I've encountered to date:
* The GUI is very slow, sometimes to the point that mouse clicks are missed, and certain portions of the GUI are not rendered.
* The time can be out. At one point the