- GPS fix is extremely fast
- Weather (supposedly, I haven't seen it yet)
- Bluetooth connection to smartphones (this is a neat feature, allows uploading rides in progress so others can view where you are. upload rides)
- Slightly longer lasting battery (20 hours vs the 800's 17)
- Activity profiles (Race profile, training profile etc)
Took a while getting used to the new features and different menus but so far I like it although like any other Garmin product I've bought it's got the usual initial bugs that take a few updates to iron out. Display isn't any better than the 800 with glare issues.
Update on the Giro Air Attack: Best fitting helmet I've ever owned, I end up always using the shield because it keeps the heat from my face however it smudges easily and I still don't know where to reliably get replacements.