Personally I wouldn't buy the current version, although I have one which I bought some years ago and which now lives in the spares cupboard.
With only an internal aerial I didn't find the wireless range all that good, it's only got 3 usable Ethernet ports (you need the fourth for the modem) and it doesn't support native IPv6.
It's OK as far as it goes, but you can get much better routers for the money. Even the next version will have to be pretty special to get me to part with my Asus RT-66NU
(Which doesn't have AC wireless either, but with the speed that the Asus can run at I don't need it