I just got my Vox on the 30th last week, and I applied the new update right out of the box. As such, I have no knowledge of what the brightness settings behaved like prior to that. I can say that now the lowest brightness available from stock settings is applied the same across all apps, is no where near dim enough to not drive my wife crazy while I read in bed, and could benefit from being a bunch dimmer even during daily use.
This app does it all, and for free to boot!