Congrats! There are a few of us using this combo (AX and ECD-1). Just got mine last week. Isn't that a great DAC?
And, yes, AX is bit-perfect with low jitter.
Yeah, I was focused on this DAC a year or two ago but didn't want to spend that kind of money even at it's used prices. I then thought about the Benchmark or the Bel Canto but started reading reviews of NOS dacs and ended up with the Audio Mirror. It's a very dynamic and enjoyable DAC but now that I have the Grado PS-1 and heard them on highend cd players a while ago at a meet, I wanted to see what I highend DAC could do. I was pleasantly surprised. Whenever you think things can't sound better, they somehow do. That's why you should avoid any meets.
But anyway, yes AE works as great transport giving you the wireless convenience to have access to your complete music library or any other library on your network.