I just ordered one of these.
I had a 20% Off promo code on top of the price markdown, so I got it for bubkis. My router is a dual band Belkin, so I figured a dual band extender of the same brand would make sense.
I like the 5Ghz integration on that one. The D-link does wireless n, which helps punch through network congestion, (2.4 Ghz routers are more common along with 2.4 Ghz cordless phones, 2.4 Ghz alarm systems, and microwave oven interference) but it doesn't do the less common 5Ghz.
Although 5Ghz doesn't punch through walls as good as 2.4 Ghz.
I'm so confused. This article
although somewhat outdated does explain the differences between 2.4Ghz vs 5Ghz technologies pretty well.
So if wireless interference is a problem, 5Ghz works better. If you have thick or many walls, 2.4Ghz is better.
They don't cover n vs g. n is faster than g, but it will only matter for your internet connection if you have a 50 Mbps or greater connection. The big difference for most users with n is computer to computer file transfer.