I really like the heads up display and would recommend it. The ClearSight mirror is something else to consider. The view out the back isn't great without it.
Kodi
Have to say your probably right about being mad when someone ignores you (for a week or so). I have only one friend who does that, and the only reason Im ok with it is she is an old friend. Gives me anxiety as well sometimes.
Tutuapp 9apps
Cool idea. I recommend showing a disclaimer in the beginning that says the others may see your exact location. I understand this is just a fun app but you never wanna get involved with legal issues just in case. ps : i recommndd it
Kodi