I've been using my AR3 for 3 months now up 3hrs a day 5 days a week and I've found a few software issues. I run with no modifications and on an iPhone 5 on 7.0.4. The phone sits in the glovebox and isn't touched but some cases I have to.
1, hands free calling while listening to MP3 , you take a call while listening to music , you end call to find the app radio app has turned off and you have to reenabled it. This means messing about with the phone doing 80mph on freeways in my case which is not always pleasant.
2, turning vehicle off leaving the phone connected and then restarting the car sometimes locks up the radio and can't access the app side of the radio, fix is to pull over , turn car off , remove phone , restart car , reattach phone.
3, removal or one time acceptance of the comply OK turn on message.
4, factory unlocked touchscreen so you can remove my issue 1 without near fatal consequences.