If you get regular Up2Dates and pattern updatess automatically, then I would think the auto-update to V8 would work. I'm recommending to my clients with Mail Security that they wait until 8.203 because of a change in the RDNS/HELO behavior. Everything else is good from what I see.
Cheers - Bob
Sophos UTM Community Moderator Sophos Certified Architect - UTM Sophos Certified Engineer - XG Gold Solution Partner since 2005