I have two and planning to pick up a 3rd (want to have two at home, one at desk, other in bedroom). Everyone I know never understand why a 2nd charger is usually one of the first things I buy when I get a new portable device. Right now I have one at home (which I carry back and fourth between my room and desk) and the other at work at my desk. Having 2 is a must because I now bring in my SP3 to work every day and lugging back a charger, constantly plugging and unplugging it 4 times a day, 20 times a week just isnt something Id enjoy. I would get tired of fiddling around with cords everytime. I dont even have to carry any charger with me anywhere. Pull the end from the SP3 connecter, slide the SP3 into my case and its done. Dont have to unwhine tangled cords, reroute them, bunch them up, pack it up in the case, unpack it, etc. Besides, what people under estimate is that it saves a lot of wear on the charger plugs itself by not pluggin it in 4 times a day. Everyone here at work always carry their charger with them everywhere with their laptops and are constantly plugging it and unpluggined it into socks, 4, 5, + times a day, unwhinding tangled cords, etc. And some of their power packs are huge and super long. Stuffing them into tight bags, etc.