It comes down to personal preferences and opinion.
A lot of people say TVs work terrible and look terrible as displays. I think that is from the group that place PPI above all else.
I have been using my 32" TV as a monitor for my computer for over two years now and it has worked wonderfully. Given the additional functions the TV has and the cost of monitors and my preference for large screen size, I would never buy a monitor when I could just buy a TV for my computer to use.
But again, some people would say the complete opposite so it depends on you. Try it and see how you feel about it.