I have been using SD now for approx 5 days in my car. So far i can say that it is the best CarPC software. Saying this I have been using Frodoplayer, RoadRunner and CentralFuse. Some are a nightmare to configure, other are just not stable or are lacking many important features. SD ran without any crash.
Nevertheless two things need to be changed. I know you could skin or work around the below requested features. But I think this would be very well appreciated features for an out-of-the-box solution.
1. QWERTY keyboard as default
2. Music navigation / loading should be much simpler