I bought one of these and I think I am going to return it / sell it.
I like it. BUT... I don't like how the FM transmitter adjusts the station it talks to. It simply goes up one channel at a time. Makes no effort to pick a station that doesn't have something on it. I drive back and forth between two radio markets and have to switch the FM transmitter portion every trip. This behavior makes it a huge issue.
I also have a Motorola MotoROKR T505 as well and have had it for a while in another vehicle. They are VERY similar in function. Even the English female voice is the same. BUT, the Motorola scans for a free frequency and gives you the option to toggle between favorites. So once you find a couple good ones, you can set the pre-sets on your radio and just go between the good channels as you drive.
Won't be an issue anyway soon. I will use the Motorola in the company car. I am buying a Ford Focus with Sync and will use that for personal use!