might as well post this info.
I have the rt-ac66u. Fantastic router, some slight things you need to be aware of.
There is no tomatousb for the ac66u, there is one for the n66u.
Also if you were interested, the n66u has a microsd slot inside the router (not accessible on the outside) and you can install optware on it, run linux programs, etc.
You can do the same for the ac66u, but they removed the internal micro sd slot.
Even thought there is no tomatousb for this router, there is merlin wrt which is a custom version of the base asus firmware that adds stuff like vpn, ftp, etc and is supposed to be more stable as well. You can still install optware on an external usb drive (flash or harddrive) and run programs as well.
What kind of programs? well you can run umurmur (mumbles server) host your own webpages on your router, ftp, torrents, etc. this thing has a 600mhz cpu and 256 megs of ram. it's a small linux workstation if you want it to be.
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