Some projection TVs have problems with viewing angles. If you are to the far right or left of the TV, hard to see the TV. Also, lighting can be a factor. Most projection TVs look best when the light is darker in the rooms. If it is a very lighted room, can affect the picture. Now, they might have gotten rid of these issues.
If I was you, I would spend a little more money for a Plasma or a DLP. The prices have came down significantly.