Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: No Signal in car...

This unit works great for a few weeks. I have been through two in the last year. The first unit had the same thing. They work for a few weeks, then it starts taking longer for the signal to be found. I get the message Acquiring Signal for anywhere from 10 to 40 minutes. Customer service first told me this was not a common problem. An obvious lie since this is the second unit it has happened to. Plus there is an earlier positing here that sounds like the same problem. The first time, they agreed pretty quickly to replace the unit. That took about 3 months after originally saying it would be 3 weeks. Now, it has been about a month waiting for a third unit. I am locked in with the annual contract or would definitely get a different model if not go to XM. The other annoying feature is storing songs. It allows 20 songs to be put in memory. This is in contrast to the Starmate which is a more compact unit and lets you put artists into memory as well.