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I just recently purchased the fitbit zip, which I am loving for the motivation and challenges - but I am thinking of upgrading to the wrist style and was wondering if anyone could give me their opinion on the one they own - I am leaning towards the Alta due to the slim look, but and considering also the charge HR or waiting for the charge 2 to be released - I've researched on line and there are so many pros and cos on both - would like to get feedback from people that are really using them - Thanks!!!!!