I just received and installed my BlueStar II in my 2008 Buick Lacrosse (Class2). I use it with an iPhone 5S. I was astounded that it works so well! It is a great product. I had it installed in about 2 minutes by not removing the OnStar box. The only issues I have are seemingly caused by the iPhone apps I use, but I thought I'd ask if anyone knows a solution.
The iPhone iOS 7.0.3 "Maps" application doesn't interrupt the stereo and speak via the vehicle's speakers at all, but Google Maps does, so that is what I usually use. However, sometimes when it interrupts the stereo audio, it lingers too long or hangs-up indefinitely. This is maybe once out of 10 or so interruptions where this occurs. I have found through experimentation that I can unlock the phone, bring up the Google Maps app, and then lock the phone, to get the audio interruption to go away. I don't see any iPhone or App settings that can affect this, but I have tried the ones that seemed to offer hope. Any other ideas?