A recent survey of 3-D TV users conducted by Parks Associates, a Dallas market research firm, found that a surprising number of respondents – 56 percent – were “very” satisfied with their 3-D experience. But there was also a deep undercurrent of frustration, said John Barrett, director of consumer analytics at Parks, including such caustic comments as “waste of money,” “glasses are a pain in the neck,” “limited 3-D experience,” “not worth the trouble and expense,” “glasses not comfortable,” and “content is very limited.”

From the article, "US researchers develop ‘glasses-free’ technology."

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