Regarding some of the comments, the other N900 competitors tested (E4200 V2, WNDR4500, Zyxel NBG5715 (initial firmware at least) etc. performed worse, on average and overall, in terms of wifi performance (2.4 GHz).
Some (WNDR4500 e.g.) have a lot of complaints about poor performance and / or poor stability).
Just to illustrate the top of the line Netgear WNDR4500 has received 44 1 star and 2 star reviews on amazon out of 174 total reviews and many of these are
after it had been on the market a while and after Netgear had released four firmware versions.
People claiming it drops connections every 2 hours etc.
Not exactly my idea of a better alternative.
Most of these N900 competitors cost around the same price as the RT-N66U or more. In fact the Zyxel NBG5715 MSRP is $250 (can be had for a lot less on sale but still the same price as the Asus amazon and newegg price) and the E4200 V2 is $20 more than the RT-N66U and performs worse on 2.4 GHz wifi).
For most users the routing performance is the biggest reason they buy a router.
The RT-N66U's predecessor RT-N56U has the highest WAN to LAN throughput and highest total simultaneous throughput of all the routers SNB has tested.
The 66U has even more memory and processing power, so it will likely be even better and thus be able to effortlessly supporting multiple simultaneous connections.
The E4200 V2 that cNet gives their editor's choice award leaves something to be desired in terms of 2.4 GHz wifi performance (cNet's own tests show this clearly ironically).
The RT-N66U is also very stable (no reboots since I bought mine about 3 weeks ago).
The issues, while I fully agree the bugs should not be there to begin with, are being worked on.
All I can say is the competitors' offerings also have or had bugs / non-working features too (E4200 media server storage issue took over 3 months to fix) as well and, worse, I have yet to find one with better 2.4 Ghz wifi performance.
My Asus router is doing a mighty fine job and Asus has been making firmware updates a lot quicker than Linksys.
Linksys releases them once every 3 months (even for a major bug like media storage not working).
I had the E4200 v1 and was honestly happy with it (did not need the media server or I would have returned it like many others rather than waiting the 100 days till the fixed it . The issue lasted from June 2011 - September 2011) at the time, alhough in hindsight I did not know what I was missing in wifi performance until I bought and tested the 66U.
The Linksys media storage issue with the E4200 v1, which arose in a new firmware (that added IPv6 support) after the router had already been on the market 2 full months (it also had a flashing logo bug that took them 5 months to eventually fix - they did not even acknowledge it was an issue when I called it in despite numerous users being affected).
Anyway, I have no connection with, or allegiance to, Asus and would have happily kept my Linksys E4200 v1 or Zyxel NBG5715 had they not been so disappointing in terms of 2.4 GHz wifi signal strength
at longer distances.
Given that the RT-N66U has only been out for 1 month and they are already on the third firmware (a lot more frequent than Linksys which the whole time I owned my E4200 v1 never released an update more than once every 3 months and I bought it one month after it came out, so it is not as if it was a fully mature product).
Anyway, that is my two cents. I honestly don't care about one brand over another. I just pick what works best for my needs (I admittedly do not use port forwarding).
Buy whatever works best for you...
I am looking forward to Tim's test of the RT-N66U.