I haven't been on these forums in years, however I had to sign in to add my 2c.
I have a DSL-N12U router. At first, I was pretty impressed with it, until I realized that all the horrible lag I was getting while gaming was caused by the router's built in DSL modem. Horrible, horrible latency. Doing a traceroute would get timeouts on first hop after the router. At first, I blamed the exchange, but many logged tickets with Telkom and them not finding anything wrong led me to plug in my old router. No issues. Brilliant connection, everything peachy. Plug the Asus back in, horrible lag. Eventually I bought a cheapy d-link basic modem, and used that in bridge mode with the Asus router, as the wireless on the router is great.
I've also managed to DDOS the router with the star citizen patcher. If I leave the patcher at default settings (unlimited bandwidth), the router stops responding. It's a very bizarre issue. Kill the patcher, the router may start responding again, but otherwise I have to reboot it. If I change the patcher settings to about ~100kb/s then it's fine and the router is happy. This was a few weeks ago.
Everything has been fine since then until today, where I had a download going at full line speed (10mbit), and the router stopped responding again, and I had to reboot it.
I think the particular router I have is a lemon, as most people I've spoken to have had nothing but good things to say about Asus routers.
The only other annoyance with it, is that it wants a reboot for every bloody setting change.. and it's not a fast booter.