Has anyone had much success using these converters to display their computer screens on a flat-screen TV?

I'm considering buying a new TV soon, and the one I have my eye on does not have a PC input slot. I watch a lot of shows using my laptop connected right to the TV, so I need some way to be able to do that.

I know I've heard stories about converter boxes not working very well and possibly screwing up the image once it gets to the TV.

If anyone could provide some insight I would appreciate it a bunch.