I 'd like to implement but the performance ( speed ) has been terrific and stable
How do you like the performance?
asuswrt is by far the best firmware for this router right now, unfortunately.  I say unfortunately because it lacks the features and customization I've grown to love from tomato (shibby in particular) and dd-wrt.  That said, the performance is excellent and I recommend this over it's n66u cousin.  One of the (two) wireless interfaces on this is a newer broadcom chip with more features that the twin interfaces on the n66u, so even if you don't use ac (yet), you still have a better chip at your disposal.  Unfortunately, going back to the firmware problem, you can't squeeze or customize much out of the new chip with the current firmware and lack of third party offerings, which you currently can with the n66u.just for example, the default tx power, as listed by wl, is 1500 (!) mw (using the latest asuswrt firmware).  That is about 1480 more than I'd like.  Thanks to a user named Merlin, we can download a modified version of asuswrt and customize settings beyond the webinterface, and in using it, I can set the power properly, as well as a bunch of other features (iptables droplists, upnpd custom settings, dnsmasq custom settings, hosts file, cron jobs, and more).  Even by setting the txpower to a sane setting through the webinterface, BTW, it still defaults to 1500 (or 1496ish) for some mysterious reason.  Atleast as reported by wl (the main configuration and settings program published by Broadcom).As for performance, I am very pleased.  I can break 300Mbps using an tri band N adapter w/o problem.  Also pleased with the stability.  Just wish shibby could implement the key features (speed speed speed) of asuswrt firmware into his code so I can use some of those terrific features and bypass the hideous default/stock webinterface.In short, this is a terrific router for the coming years.  At the moment however, the n66u with tomato shibby firmware is probably better.  That said, I don't regret paying the price to be forward compatible.  I'm lacking a few features I'd like to implement but the performance (speed) has been terrific and stable. 