I don't know what it is with dual-band draft 11n routers and D-Link, or the obsession that people seem to have with them. But, judging from my mail, some people are really anxious to find out how this router checks out.
So as to not keep you in suspense, I'll give you the bottom line up front. If you liked D-Link's single-band draft 11n DIR-655, then you'll like the DGL-4500. Whether you want to pay $60 - $70 more for a nice, but not essential, OLED display and the ability to use the less-crowded 5 GHz bands (assuming you have the wireless client adapters to match) is the main issue you'll have to decide.