I cave with the intermediate one regularly, if the wall is close and shiny it can get glarey, and people hate you looking at them, but you can always swivel one up and out of the way.
I haven't climbed with them, but carry them for the walk out. they may be a bit bright for use on rock, after all you only need to see a couple of meters, not 30...
Battery times are more like 4 and 8, minimum |