I just purchased a N66U to replace a 2007 Airport Extreme (not sure if it's gen. 3 or 4). I tried a WNDR4500 and it did not outperform the Airport at extended ranges so I returned and got the N66U. The N66U had significant slowdown and eventually would drop the connection. I played with the settings; power, channel, etc... upgraded the firmware to .246 and then it bricked and I could not recover it. Amazon is sending a new one. What should I be expecting? I'm expecting that a 5+ year newer router will yield better throughput at greater ranges. I not expecting miracles just that it outperform an old Airport Extreme. Feedback would be greatly appreciated, thanks!