Okay, had the R7000 for about a week now, and here's my observations:
1. The bad:
After resetting the R7000, and getting an internet connection going, if I try to restore settings from a good saved settings file, the internet connection gets dropped. So I have to reconfigure it manually after resetting it.
Can lose internet connection during configuration, like make a change in a setting, and the internet connection can be lost in the process. At one point, I went to turn off UPNP, since I don't have any reason to have it on, and what do you know, lost my internet connection in the process. And when the R7000 is finall fully configured and connected to the internet, and I reboot it, it comes back up having lost it's internet connection. The only way that I can get the internet connection back after it's lost is by resetting the router and manually reconfiguring it. Very time consuming and repetitive.
Attached device list is not complete and is hard to use, since client/device names come and go, and they aren't all there. There's no equivalent to the DHCP lease table in the rt-n66u, so if you want to know what's connected it's really handy to have the MAC addresses of connected devices memorized.
In general, the admin GUI is not very useful, needs to be re-worked to have more information in it, and to be more user-oriented. At first, I was getting way too many web admin GUI page stalls, and using the GUI was slow and painful. At some point, that stopped, and the GUI speed became normal. I don't know why the GUI was initially very slow, or why it stopped being slow.
2. The good:
Great range and speed on wireless. Somewhat better than the rt-n66u, which surprised me. Works fine with Android phone and iOS 7 in iPad, as well as laptop using Windows 8.1. No problems with connecting devices to it once it's all up and configured. This makes up for a lot of inconvenience in configuring, but not all of it.
Did stay up for 7 full days with no problems after I finally got it all configured, but at the end of that week was having some problems with 5GHz. wireless. That ended with the usual loss of internet connection, and I had to reset and reconfigure *smile*. Spent most of yesterday evening dealing with that.
Today I've been looking more at the loss of internet connection, and found that resetting my cable modem seems to restore the router's internet connection, at least in the situations where I've tried that. Don't know why, there's nothing in the modem log about it, and the R7000 logs don't show anything, either.
3. The future:
Looking forward to firmware fixes for the problems with internet connection, and hoping that other things that are working well now don't get screwed up in the process *smile*. I also hope that they will improve the admin gui, especially the attached devices table, and the level of detail of the settings. It would also be nice to have more useful stuff in the logs. So the firmware future of this router is the key for me. And there's a long way for Netgear to go to make me happy with this one.
Update: The problems with the internet connection have now been reported to Netgear.