I did own the XA100.5 and now have the XA160.5. I heard the XA30.5 driving Magico speakers at a dealership. "...hopefully liquid, detailed, smooth and without glare/distortion in the highs...." is how I would describe all three amps. I would add: dynamic, great control over bass and sense of ease to the description. They are also transparent with a very natural timbre and tone. However, they are expensive, and to my ears, they are not the last word in neutrality, but they are extremely close. I have found that they sound better with Pass preamps than with other preamps I have heard them with, especially some tube preamps.
I have not heard the Audia Flight amps.
I have not heard the Audia Flight amps.