I know about Vision Divine, but mainly because I'm italian
I like some songs here and there but I never really followed them.
Luppi is great but to me Secret Sphere don't sound the same with him. When he was busy with Whitesnake Secret Sphere had a show booked in my city and they filled up the vacant vocal slots by having many singers of the scene show up to sing some songs. The final singer was their original one, and they played only A Time Never Come songs. That's one of the best italian albums of the power metal scene, ever.