I really like mine, and the battery life is actually really good. Mine lasts all day after I forget and leave it on in my backpack while I'm at work, and I find it very comfortable.
I actually have had one since the $100 credit from the original iPhone days. It actually isn't too bad. Granted, it's super low, and the battery life sucks, but the smallness of it is awesome. I wish there was another one that was better but the same size. (Maybe there is, I just haven't seen it).
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[www.buy.com]
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Downside is that once you get used to it being in your ear you forget it's even there and end up walking around looking like a tool.