The inexpensive converters require both a box and special software to accomplish the job. The more expensive boxes do everything with hardware. Getting a full computer image of the right color displayed on the television may be more difficult with the cheaper boxes. As with many other things, in life you get what you pay for. If you want your audience to sit, listen, and watch your presentation without interruptions the television display is a good choice.
People are comfortable being passive while watching the tube.
The television also provides excellent color saturation and clear, crisp graphics and animation. Large monitors are easy to see in brightly lit rooms without dimming the lights. Television monitors have several shortcomings. Most people underestimate the size of the monitor required. To be seen clearly, very large monitors are required, even for small rooms.