So, I've had the iVIC for a few weeks now, and it still works as it should. I have not experienced any problems with the hdmi connection. I love having access to all the apps from the phone, mainly maps/navigation and music/internet radio. At the same time I have found a new respect for the layout of the factory setup. Having your phone on the screen can be really distracting, and not as user friendly as the original interface. Also, the clarity of the factory maps and navigation is actually much better than google maps (sometimes less is more). Obviously, google maps will be more up to date, though.
I have tried to set up my phone with a minimalistic layout to make it easy to use on the road. The voice command systems on the phone also come in handy and is much more intelligent than the Lexus voice activation system. I have attached a few pics. Notice the "Home", "Back", "Settings" and arrow buttons on the right. You can remove them, but I find them really helpful. Swiping the screen to scroll is almost impossible so I use the arrow buttons instead.
There is one thing which disappointed me a bit. I still have to use the factory hands free for phone calls. This is not really an issue with the iVIC, as you would have the same problem if you connect the phone to a tv. All sound generally goes to the external sound system, but you when you make calls it comes through the phone. I have tried every setting I can think off, but I can't get phone calls to work on external speakers, so I just use the factory hands free (not really a big deal). Maybe this is just a problem with my phone (galaxy s4). If anyone knows how to use phone calls over hdmi, please let me know.