This is a selling point for me once my current D-Link dies; it'll be nice to have a dedicated N network for streaming stuff from my wired Mini to my laptop at decent speeds.
IMHO, the AEBS is worth it, especially in mixed WiFi spec situations. If you have a homogenous WiFi-N situation, you might want to compare with some of the better NetGear or Cisco/Linksys routers. However, you'll need to be fair when comparing specific models; some of the Simultaneous Dual-Band routers from Netgear cost just as much as an AEBS.