I got my Vava 4K projector a few days ago. I have an nVidia Shield TV and a 120" PET Crystal ALR screen from XY-Screen. The 4K video looks great. At 120", it's easier to tell a difference between 1080p and 4K. They're supposed to come out with a firmware update that will fix the saturation issue now that they've been able to calibrate the gamma correction, but the firmware update is still not available yet as of now.
Their Android system is some kind of stripped down version and really sucks. They don't even offer an account option for you to log into Google in their system (like the NVidia Shield TV does). So the Youtube version from Aptoide TV mall is worthless without a login to keep your channels and history info, aside from being really barely usable. I tried 3 different Netflix versions and one is not compatible with the Vava Android version and the other two won't even play properly. There's no Hulu, Vudu apps, etc. All in all, you'll want to have your own set top box because the Vava is not really usable stand-alone like they try to make it to be by having an Android based system and slap on the Aptoide TV app.
So I had to get an NVidia Shield TV box. I'm only able to get a 4K 30fps resolution selection from the Shield. I don't know if this is a Vava limitation or what. It looks like 4K @ 60fps is doable on the Shield with other 4K TVs.
The built-in Harman Kardon speakers sound great. But it's not complete unless you add in an active subwoofer. I want to just supplement the built-in Harman Kardon speakers with a subwoofer, but the audio out from the Vava (for headphones, I guess) is mutually exclusive with being able to select the built-in speakers. So I had to get an HDMI switch box that has line audio output from the HDMI in and put it between my Shield TV box and the Vava to drive my subwoofer.
The Vava seems to support CEC volume control from the Shield box (although with my subwoofer setup, I don't want CEC volume control because I want the Shield to be able to control my subwoofer volume and the overall volume, and leave the Vava at fixed volume).
However, CEC power control (turning on/off the Vava) when waking/sleeping the Shield box doesn't seem to work on the Vava.
The fan is noisy enough for me, even though some reviews claim they hardly notice the fan noise. Well, I do, but is not as distracting if you're watching a video with the volume on. The amount of heat output from the Vava (from the cooling fan) seems fairly significant to me. But I guess that's the price to pay for a 360W projector that can project up to 150".
The ALR screen with the PET Crystal material from XY-Screen seems to do a decent job of blocking out ambient light. But if I leave all my windows open in my room (3 windows and a patio door) during daylight in bright sunny Arizona in the summer time, significant washout is still inevitable. But if I just close the patio door blinds and a window, the washout is greatly diminished and I can really enjoy this screen and projector.
I don't play games so I can't comment about gaming lag issues. The 30 fps frame rate is not ideal, but I find that i can live with it. If any other Vava 4K projector owner who reads this and is able to get confirmed 4K 60 fps resolution from their set top box, I'd like to hear about. Maybe it's from the Shield end, but as far as I can tell, the Shield should be able to get 4K 60fps just fine and I use HDMI 2 HDCP 2.2 compatible cables and there's no difference if I use that HDMI Switcher box for the subwoofer set up or not. It's still 4K 30fps whether I have a direct HDMI hookup between the Shield and the Vava, or if I go through the HDMI switch box for my subwoofer setup.
Customer support seems to be OK. I emailed them a number of questions on Friday and got an answer back late Sunday night. So I'm assuming that they're located in China since Sunday night in the US is Monday morning in China. They cited their system not having a Google account login option being due to Google licensing restrictions.
All in all I think it was a worthwhile purchase for my situation because I just moved into a new house without owning any existing decent TV to tide me over to wait for better/cheaper TV technologies. So if I had to buy a brand new system, for around $3600 (for both the Vava and the XY screen), I was able to get a 4K system in 120" size, which is around the same price of an 85" Samsung 4K TV I can find at Costco anyway.
Last edited by Volusiano; 07-29-2019 at 04:09 PM.