I have the XP-25 in house with a few hours on it. I really want to give it the full week to settle down, but I also wanted to share some initial impressions. I feel it literally makes a toy out of the 810LP; it shares the same overall organic sound of the Ayre, but it clearly outclasses it by a wide margin in everything: dynamic contrasts, purity of timbre, control, lack of compression (I can finally enjoy my Carmina Burana/Telarc the way I thought was possible), soundstage specificity (separation of instruments and voices) though not necessarily size, high frequency extension, etc, lack of noise, and most of all, the unit sounds so natural, live, and true. Heifetz's and Oistakh's violins have all the power I would expect - shivering, to be honest. On the other hand, I only bought the Ayre while awaiting the Spectral phono - so not a fair comparison, and I finally decided that I am just wasting the A90 and had had enough of a wait. There are some minor negatives, but will withhold judgement until it's fully broken in.
I am equally impressed by the unit's operation - switching anything (loadings, inputs) automatically silences the output with relays, until the unit settles again; this is just beautiful architecture, and I don't understand why the manual makes a bold statement to mute the unit when making any adjustments, as if the operational behavior I am seeing is new to later units??? The noise floor is exceptionally low - virtual digital-silence at the level I listen to (past 12 o'clock, which is loud) with 66dB gain, and I had no hum issues with the XLR-to-RCA adapters - in fact, there is significant hum if I do use a ground wire.
So, unlike the 810LP with which it was immediately obvious it would be going back, the initial impression is that this one deserves my undivided attention.