Zolt didn't feel as light as the Dart when I held it, but it was still substantially smaller than every other laptop charger I've seen. And while it can charge three USB devices at once, only the top port can charge laptops (a small notch on Zolt's laptop charging cable prevents it from going into the other ports). A heat sink that wraps around much of the device keeps it from overheating, and there are small vents to let heat escape from its top as well. Now that our laptops are getting smaller, it'll be interesting to see if people will actually pay for the privilege of lightening their computer bag with smaller chargers.