Doubles as a Widescreen Business Projector
The combination of small size and light weight, plus support for 1280x800 resolution (the most popular for widescreen laptops), as well as a wide range of other resolutions, all the way up to UXGA (1600x1200). In addition, its brightness is similar to most entry level business projectors (typically 2000 - 2500 lumens). That does make the X9 bright enough to be a dual use projector.
Audio Built In
Finding a speaker on a home theater projector is truly a rarity. It occurs to me that BenQ has done so on a couple of models, but generally, home theater projectors (other than, of course, all-in-one projectors) come without audio.
Having the audio on the X9 can be handy, especially if you plan on moving the projector to different locations. True, it's only a small 2 watt speaker, but, in a pinch it can provide you with sound, while playing a game console, or even to watch some TV, in a room without an audio setup.