That depends on 3 things:
Are there a lot of radio stations near where you drive?
How close to the antenna will your iPod be?
Do you have an assistant to set the frequency when needed?

They work OK. Me, I got some adapters for the CD Changer in connectors (available at Crutchfield!), then plugged in a minijack to RCA cable. Works great! Note that I have 3rd party radios in both cars.

I am the Doctor, and THIS... is my SPOON!