I don't use it often, I helped beta test it though. I love the idea behind it, it's just doesn't have the visual appeal I like in an email client, I still use a couple Yahoo emails for a while, and even if I put in a respond by request no one follows it. If Timyo and Spark could merge into a single client, that would be a perfect email client for me. I need to download Timyo again and play around it with some more.