The most obvious downfall to using the Edublogs is the possibility of server problems. There are some scheduled maintenance hours when the server will be down, but you will be notified of those outages. If you are using Edublogs in your lesson, make sure that you have a back-up plan. The Edublog site, however, states that the blogs save automatically so you won’t lose a post that you’ve been working on.
When I first thought of using Edublogs, I was concerned that I would not be able to use the site due to the firewalls use by my school system. I was happy to find out that I could access the site at school, but you should try to use the service (create posts) at school to be sure that the site is not blocked by your school's firewall. If you plan to post YouTube videos on Edublogs, check to insure that You Tube is not a blocked site at your school.