Good value for the price. Refurbished seems to be like-new.
I bought a refurb WNDR3400, not a new one. The $35 price can't be beaten. This is the second wireless router I've owned. I just bought a Netgear WRN2000 brand new in July, and then this N600 dual band router came up, so I upgraded. I expected stronger signal strength from the N600 WNDR3400, but I'm not really seeing any improvement in range and/or signal strength compared to my basic N300 router. They both perform the same; no change in signal strength or dropouts has been evident, so far. In that respect, I'm a little disappointed in the N600. That's why I rated it 4/5 for performance.
The N600 does offer more features, though. Not as many routers and wireless devices are on the 5GHz band, and having dual-band will be useful to me if I move to a more urban area.
The big blue light on mine apparently can't be turned off. But a friend has one, and he can turn off that light by tapping it. I've tried numerous times on mine, but no dice, haha. I guess I just have to turn it off if anyone wants to sleep in that bedroom.
Overall, I think it's a solid router, and an extremely good deal for $35. It offers more features and more customizations than the more basic routers do. It's still pretty good at $54 refurbished, but if you search around the Internet you may be able to get it for closer to $35 - $40 at Tiger Direct or other stores that offer refurbished items.
eta 9/12/12: After changing the wifi adapter to a pci-e D-Link DWA-566 and connecting on the 5GHz band, and depending on what server I pick, I have seen (speedtest.net) pings as low as 18, downloads 28.5-29, and uploads are pretty much stuck at .9-.96 regardless of what adapter or router I use. Those are nearly the same results that I get with the ethernet connection, and are limited by the slower but more budget-friendly Internet service option that I picked.Read full review