did you ask on here prior to buying it? you would be happy, its a really good router. the difference is the RT-N66U is an upgrade, added features and has the ability to be toyed with loading ddwrt or tomato plus at the £30 price difference it in my opinion would of been worth buying instead. im not saying your tech connected cannot be handled by the RT-N56U. I'm just saying the RT-N66U is better and would of been the better option.
RT-N56U 3rd party firmware -
www.code.google.com/p/rt-n56u/