Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Nice idea. Poor manufacturing and quality assurance.

This screen had severe ripples across the top of the screen. Resulting in extreme ripples in the image.(Screen was to be used only for Keynote presentations). Completely unacceptable even for a Keynote presentation.During manufacturing the screen material was trapped unevenly in the top "metal bar". How this passed quality assurance, I have no idea.Quality was so bad I was afraid to try another unit.(I left it open for a couple of days to see if ripples would be reduced due to being openrather than wound up in base). There was no improvement.Thank goodness for Amazon's great return policy.