I bought the Flux 50 that ALFA tried. I have it connected to my 911, and can vouch that it is everything that the positive reviews on AA confirmed. This puppy is never leaving my system again. I am especially impressed with how it expanded soundstage in all directions and improved the naturalness of higher frequencies tremendously, as well as bass punch.
It does take a long time to run-in, about a month of being on 24/7. Initially, it sounds disjointed and a bit etched on top, which is what I suspect ALFA was hearing, but once it has +-800 hours on, the magic rolls in....patience is a virtue