"In more rural areas or older buildings you may still find that the outlets only accept the 2 round pin plugs. Also, if your device has a grounded plug, a 2-pin adapter may come in handy as in some places the outlets only accept 2-pin plugs."

This is really your only concern. The major areas have never been a problem, its when you go really rural that you will see the 2 rnd pin plugs and not be able to borrow or buy an adapter.

Cheers.