I believe P01arBear has a good point. Both Synology & Netgear are running circles around D-Link at the moment with their NAS offerings.
Let me be fair, over the last 4 years I've bought a DNS-625, a DNS-655, a DWA-652, a D-Link 8-port gigabit switch, and a DNS-323. A lotta cash has been sent over to D-Link's way.
As time has moved on, I've noticed D-Link hasn't kept up with their competition and the only market for the 323 seems to be aimed at the low-end now. That may be D-Link's angle, I don't know and I cannot speak for them.
What I can say with certainty is a product refresh is very necessary. There has been no news of any new DNS-style models coming out, nor any real captivating features or anything to keep up with what other vendors offer. I *want* D-Link to catch up. But at the rate they offer updates, I fear nothing special or good is coming out anytime soon.
Heck, I've already ditched both my DIR routers for a Netgear WNDR3700 and am amazed at what it can do, how much better (read: faster & more reliable) the same laptops are with it, and the feature set for the price (it's cheaper than a DIR-855). Synology is my next target for a NAS -- and it has 10x faster read speeds than the 323, not to mention the feature set.
So.. I'm not as huge a fan of D-Link as I once was, but I feel I owe a balanced point of view on this topic. The 323 is perfect for a low-cost, 2-bay, simple feature set. It's remarkably slower than the competition, it doesn't have the most features, of the features it has some are dated (or don't work as they ought) and in some cases impractical to use. However, the 323 is utterly reliable and simple to use.