I'm up at 5am and on the road from 5:30-7:30. It's lovely. I never used to consider myself a morning person, but today I was up at 4:55 without the alarm.
I have a hard time doing actual workouts in the evening. I have a pretty low-key desk job, but I still find that in the evening I am in the mood to chill out and cook dinner, not bust my ass on the bike.