I'm all for it... partially because I own one, partially because I love good design, and partially because my college is located in a less-than-metropolitan area.
1) You'll never know how much you like it 'till you own one.
2) The iTrip is the most thoughtfully designed, and seamlessly integrated FM transmitter for the iPod. The simplicity and simultaneous versatility of the product is what makes it a winner.
3) The lack of major radio interference in my area 9 months of the year does help with any quality or interference issues, but either way, it lets you choose ANY frequency, so you're bound to find one that's at least moderate in your locale.
I own a 4G and everyone I know is jealous of how beautifully my iTrip integrates and how handy it is (Connected with no cables, no external power, etc). I'd buy mine again all over if given the choice.