Asus P1 Pico Projector review
1,280x800 resolution, 200 ANSI lumens, 34x126x130mm, 415g
Where the P1 falls down is in support for different sources and formats. Unlike the 3M PocketProjector MP180, there's no built-in media player or memory card slot, and the proprietary adaptor cable that comes in the box only has VGA and composite inputs. It's quite a short cable, too, so unless you also carry a VGA extension cable, the P1 needs to be within a metre of your laptop's VGA port.
Whether you choose the P1 over the slightly more expensive 3M MP180 or the slightly cheaper Microvision Showwx+ HDMI will depend entirely on what you want to project, how much room you'll have and where your files are stored - 3M's projector is more suited to those who use memory cards and want to travel without a laptop, whereas Microvision's specialised Showwx+ HDMI is better if you want to project content from a smartphone. The P1 is also no good if you want to project somewhere without a mains socket.
If you want to project from a laptop and don't need battery power, though, the Asus P1 is by far the best choice. It's small, light, has a usefully high resolution and great image quality for its size, so wins a Best Buy award.