Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Weak FM Output and Poor Audio

I have owned this iPod FM transmitter for about 11 months and have used it while driving thousands of miles through many FM radio markets. In urban areas this unit is not useable, because, despite the availability of the three FM presets, you can't find open FM frequencies in urban areas, and if you do, the unit's FM modulator is not strong enough to overcome adjacent channel interference from city FM radio powerhouses, and typical poor car stereo FM tuner performance (selectivity).If you live in the country this unit's FM performance is just fine, unless of course you regularly travel to a nearby urban area.Also, my unit "overdeviates"--the iPpod audio is distorted on loud passages when hooked up to my Dodge Durango with the factory stereo installed. When the FM transmitter is hooked to my Subaru's top-of-the-line McIntosh stereo, the audio is good.I believe this product is overpriced, and should be sold with a caveat: Not useable in and around major cities.