Instruct: Classify a review into positive or negative sentiment.
Query: Not a solid product

I purchased by Rio600 after my Rio500 inexplicably quit working altogether. I would have used another brand, but I primarily use the MP3 player to listen to books from audible.com and there are a limited number of compatible brands. The Rio600 seems really flimsy, the buttons don't work consistently and the battery gage shows full and then jumps to empty within 2 minutes. In addition, the unit emits noise through the output that makes it very difficult for me to use with my SoundFeeder (which is a device that broadcasts the output onto FM radio, so that I can listen in my car without having a cassette input). I would avoid SONICBlue products if possible.