I have just started using a Godox BP820. It was great at the last event. With ETTL exposures it appeared that there was 0 recycle -- which I know is not the case but it seemed so. I ordered a YongNuo battery pack that has a tray for 8 AAs. I knew at some events or shoots I'd need a second flash to be ready as quickly as the first and the YongNuo was less. We'll see it it's good enough. Hope so.
PWP, I used Quantums some years ago (late 80's) and they were good then but not perfect. Glad to hear they improved. In those days they were just an add-on pack for existing speedlites like Vivitar, others.