Slick interface and the instant search makes me want to use the product.
But I like and trust email because it is stagnate. How is this different than Buzz (dead) or my other 'streams' like G+/Facebook/Twitter? I don't want my email to be a stream, because if I miss one, that could be devastating. I don't want email to evolve, because it is the only thing I can trust that won't become realtime.