but I can't find how it is powered, is it a li on battery? and more importantly, do they do what it says on the tin regarding coverage and speed?
Recently bought myself a Huawei E586Es one to play with just purely out of curiosity.
Its powered/charged through a micro-USB port on the bottom of the unit.
Coverage & speed is subject to the same factors as any other mobile device.... the network you are on and the location you are in.