I SPENT $30 of my hard-earned money on a Digipower rechargimg device for all of my portable devices and I am glad to carry the little guy around with me for Stateside and European duty.
It comes with slots to connect two devices simultaneously and has cables for both iOS and USB charging through an adapter that can handle 110V in the States and 240V in Europe. Its metal prongs are standard US format and they won't bend outwards to hold the unit into a worn socket. The prongs on the charger snap elegantly into the housing of the unit and the compact black plastic block won't snag on other things when stored together with other gear.
The charging cables also extend in a clean fashion downward from the unit, keeping things tidy when mingling with powered spaghetti cable clusters.
The overall output of two amps is split between two channels and that means the Digipower charger probably won't recharge an iPad. Its labeling says "iPod/iPhone" but in a rush, some viewers might think because the cable fits their iPad, the charger will suit their needs. Its one amp per channel won't connect to iPads but it will deliver a trickle charge to Android tablets like my Motorola Xoom--it just takes a lot longer to get the tablet charged.
I got the Digipower unit because I like its chunky format and I happen to have US-to-Ireland mains adapter that ensures I can use it in Ireland.
[Bernie Goldbach snapped the Digipower adapter in operation with his Nokia Lumia.]