Works great. My only downside is that when the light switch controls the light/socket it's in, they don't turn off. And there's probably a way to do that, too. Otherwise it's great!
Pros
High Brightness: The emergency bulb can provide 850 lumens at 120V AC. The output power is the same as the 60W Edison bulb. In constant current mode, the output is 550 lumens. It's much brighter than a flashlight and can illuminate the entire room.