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Upscalers aren't magical, they won't make the net signal any better than it was originally. In some cases they can seriously degrade the picture.
However, if you have something other than a CRT, an external upscaler may be better than your TV's internal upscaler. The result would be a better picture.
So it really depends on how good your TV or Projector's internal upscaler is. For more on this, head over to avsforum.com. If you have a CRT TV, you probably don't need an upscaler. If you have a fairly new LCD/Plasma/DLP TV or projector you probably don't need an upscaler unless you're a real stickler for quality.
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