Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Good quality Blu-Ray disc

Upon receiving my order of four "new" Blu-ray dvd's I found 2 out of 4 had slightly noticeable white lines on the left side of the screen. This DVD was ok which makes me wonder if some of the so called "new" Blu-ray dvd's aren't knock-offs from China a country known to sell cheaper quality goods to suppliers in the U.S. who then dump these items on the internet at lower prices.