I've been waiting on their implementation of Compact Tabs. While controversial for some, I personally feel that the new compact tab designs in Safari are a far better user experience and use of space. Kagi's CEO completely disagrees with this, and they're implementing a design similar to Internet Explorer 9.

I really want to use Kagi, but I think that their design principals are antithetical with mine and may others.

But, I think it's great for a lot of people, particularly those that seek alternative browsers.