As a dealer we do this frequently.
Typically this upgrade goes very smoothly. What usually bites us is everyone tends to forget the applications like Teleworker, YA, Prairefyre, Enterprise manager.
Just be sure to go through the release note to be sure you won't have any issues between your applications and Ver 8.0.
I understand that ver 9 may be coming out within weeks. You may want to hold off until it's out.
Ralph