Finally got my 830 and tried it for a ride yesterday. All in all I'm pretty impressed compared to my 800. I did a ride without navigation though. I'm trying that tomorrow.
What I noticed though was that after a 3 hour ride my iPhone 6s went from 100% battery to 47%. Looking at the battery stats on the phone it was mostly Garmin Connect. Is this normal?
Also, I noticed that if I lose the phone connection and go to Garmin Connect to sync it doesn't timeout on syncing the 830 and the battery drains quickly.