I can echo what he's saying about the Aria. It's not that big of a deal to me. For the most part it's accurate and the tradeoff for wireless syncing is pretty awesome.
My biggest problem is losing the Fitbit trackers themselves. I've lost two and just got the One which I almost lost playing ultimate frisbee this weekend. That's $300 lost. I like the Fitbit ecosystem enough to get the One and it's great so far.