I am kind of in the same boat. I have the Sierra Towers NrT and I am considering trading in for Piano Black now that they are available. If I do so, I might opt for the RAAL upgrade. We have an open floor plan home and listen to music mostly, however I do watch a lot of sports with occasional movies. I was originally concerned about horizontal dispersion with the ribbons since the speakers are used quite often to provide a sound track while we cook and entertain in the open kitchen/family room. Now that I see that the RAAL's don't have horizontal problems, I'm really leaning towards them. I would be keeping my NrT Sierra 1 center channel however -- we can't fit the size of the Horizon -- so maybe the mismatched tweets also pose a problem that I'll need to overcome.