[Mahn]

It's true Google has yet to sell a hardware consumer product that is wildly successful, but that's also why this is exciting: unlike with nexus tablets or phones, the possibily of becoming the "iPhone" of a new product category exists here, thus from this point of view it might well be the most important thing Google does in the next few years and they (probably) know it, hence they'll (probably) invest more time and resources than they've ever done with a consumer product before. (I'm not saying it will actually become an "iPhone", just that it's strictly speaking possible)