If the package says do not use a transformer, I would guess this is more for the transformer than the Chi. A lot of electrical items will blow the transformers. But I really don't see the Chi being in any danger!

I've used mine just fine with a transformer. I've never had any problems with it at all. If I were you I would bring it and use it (which is what I've already done). O-yeah............I bought mine in the states about a year ago and it is 110.

Good Luck!