I purchased Navigon some months back, tried TomTom the worst GPS ever in my opinion at least for the iPhone. In my area it wasn't accurate. Now, trying Magellan and very impressed so far. Navigon and Magellan are "spot on", but Magellan POI is much better than Navigon's. Many posters report that Navigon runs slow on their iPhone G3, but it runs great, smooth on my phone. I don't play music, I have a radio/CD player in my TL. Navigon and Magellan do take longer to load than DumDum, but if TomTom can't get me where I need to go, it's "worthless". Anyway nuff said....
My question is, the $20.00 iPhone mount that I bought at BestBuy and a USB charger to keep my iPhone charged, what are the advantages of buying Magellan 's Premium Car Kit, besides the speaker? I don't lose my GPS signal, I can hear it well and it stays charged.