It is certainly frustrating. I got mine and we left the next week on a trip. It is so user UN-friendly I couldn't believe it. We packed the boat anchor of a book along with us and read while we on the trip. When we really needed it we were driving (of course) and the wife couldn't punch any buttons, then I remembered about voice activation - well I haven't found any "commands" anywhere to use voice commands.
After a while we just got fed up and pulled out the Magellan GPS I brought along (just in case) and within 15 seconds we knew where we wanted to go. Forget that high priced piece of trash in the dash, get an inexpensive GPS and you can program on the fly without all the hassle.
I did use the system over this past weekend and it worked fine programming while stopped but once we past our destination it started looking for the next location on the list and I couldn't turn it off. I also had a hard time hearing the voice commands, I'm sure there is some sort of volume button but I couldn't find it.