I am using the ESR9850, microwave or not no difference cos the wireless is chui.
Over the weekend I just helped my relative configured their new N56U, On my old laptop can hit 89mbps on speedtest (with 5Ghz band) in the adjacent room separated by a wall (old HDB concerte not new ferrocement wall with the steel mesh). Never bring laptop to toilet to try though
Anyway ac is still expensive and u definitely also need the adaptors which means extra cost. Unless you really need super fast speed in the toilet, I don't think u should go for it...or perhaps if you are going to upgrade everything for wireless ac capability in near future.
Distance wise also dont know can reach or not, since its 5Ghz. if end up u have to use the 2.4ghz spectrum then u would have spent money on the ac for nothing, cos the N56U would suffice the need.