Yeah, I tried the "auto" feature once.

Thats pretty much what I do. Find the station with the least transmissions on it and use that. Then I get pissed because it sounds like crap and I sit in my car for like 20 minutes changing frequencies on the Neuros and then checking to see if it's clearer on the radio.
I get it if it's a limitation of the frequencies, but the iTrip works perfectly in my car, so that says it's something with the Neuros not broadcasting as strongly/effectively and not a totally full FM range.