I got my X8 for €560 as a B-stock item with a "Men's Day" discount (the original packaging had a small dented corner, but the unit itself is brand new and in perfect condition).
I’ll definitely be getting the Windows kit as soon as it’s available. I’m coming from a Topping D90III—and before that, an ESS DAC plus Class A amp—and I find the X8 to be a far superior package in terms of features and usability; the AI function, in particular, is not only fast but works really well.
The AI has understood exactly what I wanted every time so far and executed it just as well. This is especially true when trying to match the sound signature of headphone "X" as closely as possible to headphone "Y" (within the same class, e.g., dynamic or planar); comparisons with the actual original headphones show the results are startlingly close,
and in doing so, one can retain the physical characteristics of the headphones, such as the orientation of the drivers toward the ear, which can create entirely new experiences. The AI can even factor in the use of different ear pads.
The adjustable stereo widening option available in NOS mode is a highlight; it ensures you don't miss the superior, airier separation usually associated with oversampling—something often lacking in most NOS setups.
The only thing that bothers me about the X8 so far is the auto-power-on feature (even from standby), as it always turns on whenever I switch on the power strip connected to my PC... where I’d actually prefer it to stay in standby mode. But that’s a personal preference I can live with.
In any case, with the X8, I’ve found my "endgame" all-in-one DAC/amp —and after selling off my other setups, I even have money left over to replenish my savings.
Edit, with the Windows, i plan to change all LEDs to the golden Ampere LEDs, ( more gold like color than orange ). It will looks phenomenal, especially in this black housing, and gives the electronics an extra special flair.