Hi as stated this is my 1st mac. I have 2 targus all singing all dancing chargers but they don't do mac tips. I know modded tips are available (macguiver?) but they're more than buying an original. I need possibly 2 extra chargers and have seen them advertised for around £15. Obviously not originals. Are these going to damage my lovely new air? Do you know of any alternatives? I see some chargers now have a usb port to charge your iphone simultaneously, is there one available for macbook air? Thanks.