I guess the reason that I personally use an Airport Extreme (in conjunction with another device for NAT) is that it's really one of a small number of 802.11n dual-band APs I've tried that actually works without locking up, becoming unstable periodically, dropping the session from overheating when being pushed to 100% for hours, or requiring a daily reboot. There are just so many other consumer level 802.11n APs that either fall short or are incredibly frustrating and unreliable. Thus far, I've been using an Airport Extreme Gen 5 and Time Capsule Gen 4 as my primary AP with over 12 devices attached to each one for the greater part of a month without a single instability. It's that kind of stability that really sells it for me, even with 3x3:3 out of the picture.