I would recommend the Litebook if portability or space are key considerations for you. This device is compact and very portable. It comes in a nice carrying case with power adapters for other countries. I was able to take it to work and use it at my desk, and only the people sitting next to me noticed it. So, I would recommend it for use during travel or at the office.
However, the small size that makes it so portable is also Litebook's biggest negative. The area of light projected was small enough that I felt like I had to sit in one position the whole time I was using it just to keep my eyes within the appropriate range. I have now purchased a larger device, and while it takes up a lot more space, it allows me more freedom of movement. If you are just using your device at home I would suggest a larger one.
I also felt the battery on the Litebook depleted very quickly. If you purchase this product, I would recommend using it with the power cord whenever possible, and only using the battery when you really need to.