I researched projectors on and off for the better part of November and eventually went with this Formovie Theater.
Having read though many reviews I knew what to expect with some of the limitations and annoyances that many people posted about.
In terms of my equipment to compliment the projector:
-Using 4k Firestick.
-AudioQuest Forest 48 HDMI.
-120" Spectra .5 ALR UST Screen.
-Dennon Reciver and Definitive Technology 5.2.2 Dolby Atmos with 2 additional Sonance in ceiling speakers.
-Built my own media console due to the center channel conundrum. (Equipment wose: console was probably the hardest thing to sort out and spent a lot of time trying to find something and never did)
The initial framing of the image was frustrating as I struggled to fill the full screen. The Spectra Screen mounting instructions were a little lacking and ended up having to remount the screen 1" higher but that's more on the screen than the projector. Like other have noted, the upper 3rd of the screen tends to be a little more blurry even with the focus correction. There are wheels on the sides of the projector that help balance the image and I leveled the projector several times to ensure a square image.
Once you get the image framed as well as you can there is a frame of light that hits the wall behind the projector that is a little annoying but it seems like that's the trade off to fill the screen. Pictured below.
I was actually pretty pleased with the picture quality of the stock selections. I don't know if it's the Spectra Screen helping it out but I have been really happy with Standard. I did calibrate the Dolby Vision to my 120" screen with .5 gain. It's just two sliders in the Dolby Vision part of the menu so very easy.
I blacked out the room but the image is still bright enough to view with the lights on or the curtains open on standard settings but personally wouldn't like trying to watch in a well lit room.
I did test the built-in sound on its own and it is much better than a traditional TV design. But as good as it is, if you are wanting it for a theater room then you should plan on upgrading your sound.
I did not have any issues with eARC with the Firestick plugged in directly or running through the receiver.
For $3k I don't think there is another projector currently on the market that can deliver the quality and features that this projector can.
All things considered, super happy with the projector and I have recommended this item to some friends who are interested.