I don't understand the tendency on here to repeat exactly what someone already said without providing any new information.
I used my charger for the 450D in Indonesia, Singapore, Malaysia, Thailand, Cambodia, Laos, Vietnam, Hong Kong, and China. Not to mention Europe, Africa, South America, Australia. No problems.
Pretty much any modern day electronic (not any electric, electronic) will run fine on either system. Electronics run on DC current, so AC line supplies need to be rectified, smoothed, and downscaled to usually around 3.3 - 12V. The components that do this can easily be made to handle a wide range of AC input, which is quite convenient. I would always check the electronic or the transformer (the brick between the cords on a laptop charger) to be sure, but in general the only things that are going to have issue are simple non-electronic devices like electric shavers and curling irons.
