I will give you a pro/con
Pro:
Gamefuel Intellegent QoS
USB for printer/storage
External and upgradable/replacable antenna
2.4Ghz OR 5.8Ghz
Gigabyte WAN and LAN
Faster chip and more memory then the DIR series.(Opinion/fact)
Cool factor (OLED, shiny black, etc)
WISH (Wireless QoS)
Con:
Not compatible with any 3rd party firmware(OpenWRT,Tomato, etc)
Cant do 2.4Ghz AND 5.8Ghz
Expensive (Opinion)
Runs a bit hotter then most routers(Opinion)
Hit or miss Technical support (Opinion)
The technical support isn't meant as a insult at anyone, just have had a few less then helpful experiences with technical support, thus what brought me here. This forum is great, just wish the Moderators were a bit more active on it. Not a complaint though, I am in the industry, so I know what its like, but thought it should be mentioned if he was looking for a honest answer. Overall, I love my 4500. Not as much as my 4300, but still in the top 5 routers I have ever bought.