Out of curiosity what was your previous router? My isp gave me a Technicolor (Thompson), pretty crappy, cone-nat isn't fully implemented, and it hates p2p.
As for the rt-n66u, it's a pretty solid router. If you're adventurous, there are a couple of third party (based on official) firmwares merlin-asuswrt is the most popular
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I have an modem/router: Ubee EVW321B (standard with Ziggo ISP in the Netherlands). Few months back I called my ISP to put that darned thing, into bridge mode, so it is now only forwarding traffic. My router does all the work now