I have the 430N and haven't had any issues. I will admit though I don't use it to it's full potential. I looked before purchasing the jeep and the 430n seemed to be better than the 730 based off of what people were saying. Plus it was cheaper so I went with it. I really didn't like the looks of the non touch screen radios which was why I went with the 430n. I could've went aftermarket I guess but didn't have the extra cash at time of purchase so another reason I wanted a touch screen from the factory.
I have a bunch of songs on the hard drive and I love that feature because I have a crap ton of songs on my phone and it won't take anymore. I really need to get an iPod. I listen to my phone a lot but used the songs on the hard drive a lot last summer when we went to Colorado so that my phone didn't die. I freakin hate having cords everywhere, like charging cords and aux cords etc. I've always been like that. Even in high school I ran the cord for the radar detector behind the A pillar trim and then hard wired it into the ignition so you never seen a cord and so it would turn off with the key. I always hid speaker and amp wires under trim or carpet. So I really like the blue tooth feature of the radio.
I honestly haven't used the nav much. For one we don't travel much, lol. Even when we do travel I still look at a map or a map on the computer and try my best to study and plan the route. I think some of that gets back to when I had a motorcycle. I was only good for 100-150 miles and then I would need to get off and walk around and usually go to the bathroom. So I would always try to plan for that ahead of time. I rarely used any GPS/nav for that.