I like the innovation on this product. Obviously we need to see reviews.
I do take exception to the claims right at the start that we sacrifice viewing experience for portability.
Take for example the Nexus 7 2013, I bought it 2 years ago for $89 and its battery life got poor with age, so I did a DIY $10 ebay battery replacement, took me 30 mins with watching youtube guides repeatedly and following slowly. That tablet is 7" and 1920×1200 pixel resolution. If the place I'm in doesn't have Wifi (or bad Wifi) I wifi tether it off my cellphone I usually park on the window to get best cellular service and have the 7" screen about arm's length. About 7 hours battery life on video vs Capsule 2.5hr. At a typical "arm length" from my face of about 18" it is the equivalent of a 100" screen which is 21 feet from my face. Further, the light back to my eyes is brighter because brightness drops to the square of distance. It takes that 100" screen 21ft from my eyes 200 times the amount of light from the projector to become the same brightness in my eye, this is due to scatter off a surface which is to the square of distance (like if you are near a light bulb it is brighter than further away). The Nebula Capsule at only 100 lumens will need a dark room to be make a larger image.
No, projectors are not about personal entertainment, they are about group entertainment, so business meetings where you can control the projector's known quality, audio/video sound+video, parties, etc. Later in the video they show parties, that is a more social situation to which I think it could be an excellent fun solution. So streaming a youtube music video playlist onto a small wall area.
I currently if I need to make a group audio, I use an Anker Nano for voice or an Anker Mini for music, both those are excellent sound and value for money.
Oh, and if you cannot hire a real person who can speak English for a voice over, that computer generated American English voice isn't fooling anyone. But I guess its one more type of job being removed with technology.