Input options and setup:
As mentioned, there's a lot more options for how to use these pocket projectors than the old pico projectors, and they're more convenient. When you boot up the P0510 for the first time, you're presented with options for connecting to a local WiFi network, an Windows, Android, Mac, iOS device, or SD card media. The wireless options are great, and they're pretty easy to set up. I tested them with Android 6.0, Mac OS X El Capitan and Windows, and all of them just required a short pairing process and then hitting "share screen" on the device. I also connected the P0510 to my home WiFi and it found and downloaded a software update, so it's not a static feature set; Lenovo can keep making it better.
Like the ASUS S1, Brookstone Pocket Projector and AAXA P4-X, the Lenovo P0510 has a rather low 854x480 resolution. This was evident when binge-watching HBO's Silicon Valley compared to my laptop and phone's displays, but it actually still looks alright. The screen is pleasantly large(Lenovo quotes up to 110") and despite only putting out 50 lumens, I thought it was sufficiently bright. Still, considering LG's PH300 and the ZTE Spiro 2 are capable of 720p images and in the case of the LG, 300 lumens for only $150 more, an update might be due pretty soon for the Lenovo.
Another problem was that, especially when using Airplay as opposed to Miracast, there's quite a bit of connection lag on occasion. Sometimes it would play videos quite smoothly, but other times they were laggy, poorly synced with the audio, and had artifacting. This was rare, however.
The physical design of the P0510 is utilitarian, with a two tone grey color scheme, 90 degree rotating stand design, and rubbery d-pad for controls. Those controls work well, and I like the adaptability of the rotating hinge, but I'd say the LG competition is quite a bit better looking. The Lenovo is pleasantly durable feeling, however, and there's no need for a touchscreen and entire Android-based built in computer like ZTE decided on.
This was my main complaint with the P0510. I could only get through about an hour and a half to at most two hours of wireless usage, despite the estimated 3 hours. That's enough for a few episodes of your favorite TV show or pretty much any Powerpoint presentation, but just barely.
Between the battery life, occasional connection lag, and somewhat low resolution, the P0510 is far from perfect. Yet it's also fun, well designed, and useful, all for a price that's lower than most of the competition. I might recommend waiting for the next generation(in fact, I might buy one then myself) but even the current version would be a pretty decent choice.