We've had one up and running with AutoFresh in one of my showrooms for a month now. Sound is great, and we've sold SEVERAL Autofresh systems on new and pre-existing spas because of it. Haven't sold any Aria's yet, but its configuration should be a good seller.
The music system IMO is mediocre at best. Â Watkins has already been there done that with the original TR Caspian and the fidelity was lacking then just as it is now, including all Caldera Aquatic Melodies systems. Â Watkins is at the top of the list when it comes to building a quality hot tub, but they are far from the top with their attempts at music. 
 Sorry Watkins. 
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Clearly the sound is subjective. Â I don't think it is the same system as on Caldera and the old Caspian, as there is a subwoofer now. Â To me the sound is good. Â Customers like it. Â The FM even works in the showroom, which my Jacuzzi stereos never did (when we sold Jacuzzi). Â
Price should be about $1000 more than the Vanguard.
Dan, I must have a more sophisticated sound pallet than you! 
 If you enjoy quieter music, then the system sounds fine, but it still has a problem at higher volumes.  I'm speaking of the Arias music system, not the Spaudio II.
All I need is something for my Jimmy Buffet CDs.
My complaint is the Aria does not have an IPod port yet.
