back when i worked at the apple store, they used to sell these - we got lots of returns. People were generally happier with the belkin models from what I saw.
Keep in mind, the sound quality is never going to be "crystal clear", you're always going to get some feedback, this will vary depending on where you are (out in the country will be more clear than in downtown New York for example).
It seems you're going for a reasonably priced solution - this will likely meet your needs. If the option to wire the iPod is available to you, I'd recommend that route (line in, ipod connector that many cars have these days, etc.).