I have the BR-6216Mg model, and have had no problems with it.
However, I have to admit that I could not get into the quick setup when I first installed it. I think this is mainly due to the MAC for the router not being added onto the broadband account.
If you connect all the cables up, power off the router and modem for about a minute, turn modem on, wait for all lights to settle down and then power the router on. If the internet does not work at this point, go to
http://autoreg.autoregister.net which will run you through the setup wizard. You need your serial number and account username/password to do this. Once done, you should find it work OK but if not, reboot the modem and router again in the order above.
Hope that helps, it worked for me with my Edimax anyway
edit: Edimax routers seem to support Dynamic IP addressing over the WAN port by default, so should be set up correctly for the cable modem automatically.