Setup was a breeze -- less than 10 minutes to get going and half of that time was a firmware update on initial boot after setting the wireless connection. Again, with the WiiM app on my phone, this is one of the easiest streaming systems to get going. Alexa setup was easy and the voice remote worked fine to select and play music from my Amazon Music subscription. The Ultra also had no problem connecting to my Qobuz account and playing music using the WiiM phone app. The player was also immediately listed as a Squeezelite player on my LMS server and played music from there. So, kudos for an easy-to-setup and use streamer.
Sound-wise, I've only listened to a smattering of music using some headphones (nothing fancy - Grado SR125e.) Sound was very good with plenty of clear volume at 50% the way up. Music so far has consisted of some classical, some classic rock and a bit of eclectic folk. Note these are not the headphones I commonly use (that's a pair of Hifiman Sundara's with a Schiit Midgard headphone amp) but I was pleased the sound quality I heard.
Next step is to move this into my living room system and see how it works in that setup. I'm particularly interested in how it will compare to my Schiit Lyr 3 preamp with a multibit DAC card and RPi 4 player. I'm curious if the Ultra will work as a preamp replacement for the Lyr itself as I'm quite fond of it's sound. However, I'm impressed enough at the moment, that short of uncovering some tragic flaw, the Ultra is a keeper even if it doesn't replace the Lyr. More to be revealed!