What the hell watch... I'm pushing myself here, almost making 5min/km for the whole run and coming within 10-20 seconds of my 5km pb each time, and apparently I'm maintaining or in recovery....
A few features I really like in ActivityLog2 are the ability to chart aerobic efficiency over time, to do my own critical power/velocity analysis, and also just plot weekly volume (by time or distance). That way I have a multifaceted view of what's going on rather than just whatever Garmin finds worthy of highlighting.