I own the N66U, it's the best performing consumer-grade WiFi router right now in terms of range and speed over WiFi. Of course, it's not "perfect" - I still have issues with some mobile devices in one of the rooms, But we have a very large 3-story house and my router's location is not optimal. Just make sure to place it properly (preferrably towards the middle area of your house and preferrably mounted on the wall high above the floor) and you should have no issues with its range or signal strength. Also, make sure to get latest firmware for it - the latest "official" one works fine (perfectly stable with all my devices), no need for any custom firmwares (although they do exist).
6.3L V8 451hp@6,500rpm and 443 lb-ft@5,000rpm, 7-speed SPEEDSHIFT MCT, aux oil cooler, 14.2" rotors & 6-piston calipers front, 13.0" rotors & 4-piston calipers rear, 30% LF LSD, 18" AMG wheels with Continental ContiSportContact 5P