As other reviewers wrote, this is a Europe/Asia model (the E71-1 RM-346 to be precise). If you want to use it mainly in US you should take a E71-2 (e.g. the US version) so you can use the US 3G. If you need a phone for Europe or Asia, this is a good deal because with the current currency rate it's cheaper here than anything I've seen in Europe.
The one I have came from Philippines. The manual is in English and the language can be set either in English or Philippines languages. The AC adapter is the same shape as US/Japan, and it accepts anything from 100V to 230V.
There are already a lot of reviews about this product, but here is what I love in it, in a nutshell:
* SIP (VOIP) is integrated to the system, so you can very easily initiate a VOIP call (just by typing a number or from your address book). Very convenient to make cheap international call when you're on a WiFi
* The battery life is amazing
* It's very responsive
* It's thin and slim but the keyboard is still very usable
There are a few cons in the software (such as having to switch networks manually) but unless you're really into multimedia (music/videos) it's the best phone out there.