Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware of this product and weaKnees.com

Buyer beware! I purchased a DVD Recorder, RCA Model DRC8040N, [...]to record movies off of my Tivo. After returning the unit twice and receiving a brand new unit, I still don't have a functioning recorder.The sad part is, I thought the new unit was working. I recorded about 20 movies over the course of a few months, and after each, I played back a few minutes to see if it looked ok. It did. However, the first time I tried to watch a movie (full playback), I discovered that the movie did not record successfully. Part way through the movie, the picture either freezes, skips large portions of the movie, or jumps around. I tried to watch a few more recorded movies. Same problem on all of them.[...]