The "iGo Green" technology in this is actually not the best thought out. Basically, the adapter provides power until it thinks your laptop's battery is fully charged, at which point it goes into its "Green" mode and stops doing that, only checking at intervals to see if the laptop is saying it needs charging again.
This defeats the technology now in laptops which keeps the battery from being "cycled" unnecessarily, e.g. not calling for power from the charger unless the battery's below 98% or 95% or whatever is set. Instead, the battery is allowed to drain at its idle rate until the laptop calling for charging happens to meet up with one of the periodic checks by the adapter. This beats up the battery more than the laptop would do with a steady power input - and could also leave you with a partially-discharged laptop, despite being plugged in, if you happen to catch it at just the right moment (i.e. battery low enough to call for charging, but adapter hasn't yet checked).
It also doesn't help that the adapter doesn't seem to be working at all unless you click on the hidden membrane button in the middle of the big green circle :P
It's the only multi-laptop adapter I've ever had that's annoyed me!
what I said in many fewer words ]