Indeed, the BB1792 chips were a large portion of what made me choose the X5II. My Linn Karik/Numerik pair used a quad of 1792's is still the best standalone CD/DAC pair I've ever heard in my system (and I've had several).
In my case I DID come from the iPod ranks. But my wife recently decided that I was desperately lacking in the number of large paperweights which I had at my disposal on my desk. So, in order to rectify this deficit she decided to run my venerable 80g iPod Classic through the laundry machines. And now...all my paperweight needs have been truly met.
I had looked at and was leaning toward a Pono....but whereas Ayre may soon be taking them over as a company product, that was all I needed to look elsewhere (not a big Ayre fan, their customer service...isn't). So after lots of research on the X5II, the DX50, the A&K's, and one or two others.....my shiny new X5II arrived just this morning.
Haven't had a great amount of time to play with it yet, but what time I have had has been pretty impressive. It clearly has the BurrBrown sound.
I think I made the right choice!!
....sT