I’d say go for it.
This is especially true if there’s nothing tieing you down back in the states. You have to be somewhere, you might as well be making $$ at Mactown.
I agree with Mike: you’ll know by the end of summer if wintering is right for you. If you’re unsure and they only offer you an initial summer contract, go down prepared to stay the winter anyway. Chance are good that, if you want it, you may be able to stay.
Don’t worry about 12 months… Time is on a different scale on the Ice. It’ll go by in a finger snap.