Asus has semi-unified firmware for product line. It makes keeping things up to date easier. Quality went down hill on the RT-N66U (wireless instability), and rather than stick with older firmware that had more security holes than I could continue to track or try to fix it, I went with Ubiquiti equipment.
Ah, that's a shame. I have nothing but good things to say about mine, but if issues like that happens in the future I'll likely move to merlin/tomato/some wrt (if the hardware is still viable).
(No attack, just wondering...)