KEF LS50's owner here after demoing what seemed a gazzilion ...
slight exaggeration 
... speakers for a year at local B&M shops.
Not to be a fly in the ointment but why the lack of professional reviews on the intergoogle of the AA Sierra 2's. Obviously it must be a great speaker, how else can you explain all those happy customers? I just find it odd. Is this a corporate decision on Ascend Acoustics part? I'm not trolling, just curious.