UPDATE 8/20 - Just spent 1 hour with Epson support to hear that "Wireless connections are not guaranteed" ..."Did you try another computer". I have attached a video of a stream through the projector, the audio and video on my computer are in perfect sync.
I am a consultant and professional trainer and in a constant search for the perfect presentation combination. I use a Surface Pro (latest version) with an I7, 16G RAM and 500G storage. I own 3 Epson projectors, the 9200, the 1751 and now the 1795F. All 3 of these have decent pictures, the reason I purchased the 1795 was the size and brightness, it gains about 1000 lumen from the 1751 and is HD (a little bit lower than WUXGA so the 9200 has a better picture).
I had high expectations with this projector and again I am disappointed by the under performance. The wireless is useless, terrible lag, video is VERY choppy and the audio wasn't even recognizable, just hissing and crackling. Switch to Miracast (another reason for purchase), I was using an Actiontec ScreenBeam 750 for wireless to the other 2 projectors, as far as connectivity it has been flawless. The Miracast on the 1795 is good, not great, connects up quickly but there is some slight choppiness on video (I wouldn't attempt watching a video on this), this chop is prevalent on local video (streaming from the Surface Pro) as well as if watching a youtube video. I've called Epson on this and they can offer nothing, seriously even a 20mps wireless connection should be able to handle streaming video smoothly and they have no answer why the video is choppy. If you want a semblance of decent video, hardwire to HDMI (still not flawlless).
Lets boil this down, if you want a compact, light, easy to pack, bright projector that has Miracast and don't embed videos in your presentations, this will work but its overpriced and loaded with features that don't work.
Hope this helps...
Deliver widescreen presentations in the office or on the road with the ultra slim Power Lite 1781W wireless projector, featuring easy image adjustments. This thin 4 lb. model provides 3,200 lumens of color brightness and 3,200 lumens of white brightness plus WXGA resolution for HD-quality content. Offering 3x Higher Color Brightness than competitive models, Epson 3LCD projectors ensure vivid presentations. Featuring the latest in connectivity, the 1781W can wirelessly display content from your tablet or smartphone. You can even share HD videos using your streaming device. The 1781W supports Chromecast, Roku and MHL-enabled devices. And, auto horizontal/vertical keystone correction facilitate simple setup.