I've had this a few months, and read many reviews and owners comments on the forums. I know there have been issues with software and wireless connectivity for some, but I don't use it that way. Other than calibrating it, I don't use any of the software on the machine, but run my sources of Zidoo and Roku (local content and streaming) through an AVR and let that do the work. So I use the supplied remote only to turn the machine on and off. Under that regime, I've had no troubles whatsoever.
Picture quality to me is excellent, both SDR and HDR. I purchased a Vertex2 to play around with LLDV, but honestly I haven't gotten around to it because I haven't been tempted to spend the time. Every now and then I'll get a movie or TV episode that plays a little dark, but it isn't often enough to cause me concern. I don't have an ALR screen, but I'm in a batcave with black walls behind, top, and a few feet back left and right. My non-ALR screen is supposedly transparent to sound, but I managed not to use it that way, and it's still fine. When the room is dark, the picture is often just flat stunning, and I easily prefer watching it to TVs in the house. You definitely lose some of this with even a small amount of light in the room, so I would recommend anyone in that situation looking at one of the better ALR screens out there. I think I've gotten away with a non-ALR screen only because I have a light situation that supports that. I use a 120" screen.
Many have commented on the upper left not focusing as well as the other corners. On the calibration screen I see it. Most go on to say that in practice, watching content this is a non-issue, and I'd agree with that also. I never think about it, but to be fair just wanted to mention it here. I have the picture calibrated to the specs recommended here on the projectorscreen website, and I've been more than happy.
I can't really comment on the sound - from day one I was going to run an AVR. There's not much room above the projector to mount a center channel speaker, but this is true of all UST projectors. I wound up with the center channel speaker in a table underneath angled up to my ears, and it's not great, but passable.
In short, since my room configuration doesn't support a standard projector, I needed to go UST, and after reading a lot of reviews, decided this one would give me excellent picture quality, and I am completely chuffed with what I see, and enjoy showing it off. Top marks.