@tubeguy76 I’d be curious to hear, also.
Even if you do like the Billie, the question for me would then redound to other factors to compare with other contenders:
How long has the company been in business?
How is their service for units which need a fix?
What do used units sell for?
How do they pair with other things? (E.g. Is the Billie’s preamp good enough that if you wanted the a different amp, you’d stick with the Billie as a preamp only?)
These were all factors which (a) pushed me away from the Billie and (b) toward separates.
I am so glad I have a Pass XA 25 for all the reasons above -- company reputation and service, used market value, flexibility as a single function device, and pair-ability with other components.