I am a member of a local cover band, and we decided to up our stage show by adding video. Adding a large TV screen wasn't practical due to the cost and fragility of such a device, so we decided to go with a projector. We wanted something inexpensive just in case the idea wasn't well-received and didn't work as we had hoped. We settled on the GPX PJ300B, and, honestly, for the amazingly low cost, we couln't be happier. We have used the USB flash drive input a few times, but settled on the microSD card slot for calling up our video. It works as any file browser should, and the system hasn't let us down yet. A couple of us have gotten together for football games on the patio, and after hooking up a Roku with live TV access via one of the two HDMI ports, it was a truly enjoyable experience. On stage, we use the headphone out port, and the (rare) audio that we include with our videos is crystal clear through the band's PA system. For the patio watching, we just used the onboard speakers. While small, they are amazingly loud and clear.
I have since bought one of these my family's personal use at home, mounting it from our living room ceiling. We have a Google Chromecast connected for our TV watching and a splitter going out to a few game consoles. The projector's setup is very simple, with menu options to flip the screen for ceiling mounting, as well as reversed images for rear projection. The included Bluetooth option is great for connecting it to our soundbar. Focus and keystone adjustments were easy, and it's a perfect addition to our living room.
I know there are tons of projectors out there, many with more advanced features, but the PJ300B does exactly what it says it will, and has proven to be a reliable and durable projector for some often heavy use. It even culminated in a "ball-drop" video created for my band's New Year's Eve show this year, a feature that has really given us the opportunity to set ourselves apart from other local bands, and one that the venue owner said was a first at his place and was VERY pleased. So, this little piece of tech may have gotten us another show next year!
I would definitely recommend this for anyone looking for a simple projector for a low cost. You can't go wrong. The only thing I can't speak on is longevity, as we've only been using it for about 3 months. But we play out a lot, and it's constantly being set up and taken down, so, for that, I think it will pass the longevity test.