From what I can see, it looks like something that would be useful for travelling or like above, an alternative to a 40"+ TV (or full size projector) until one can afford one.
However, for anyone who loves to travel a lot, this would be a great alternative to a tiny media player for reviewing photos and video. While most hotels and B&B's provide a TV in the bedroom, some TVs do not have AV inputs and most hotel TVs are customised, so either they don't have AV inputs or any inputs they do have are unsuable, at least from my experience of past business trips and holidays. So in this case, this projector would be very useful for hooking a camcorder, digital camera or media player up, to sit back and watch.
I don't think it would be as useful for presentations, especially with business people looking for lumens over picture quality to make sure their presentations stand out even in the brightest meeting rooms.