Ryuu

The w910i is better than the w580i in every way except the price and the call/end call buttons -_-. I think they look ugly.
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But if you're going to buy w910i, don't buy it yet, wait until it gets cheaper, and also get some bugs (if any) fixed =).
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In the end, it depends on which one you think is better or looks better lor, since they are both good =).