I’ve been daily working with WP templates for more than 2 years, and I definitely can say that Kalium is one of the bests theme ever.
It caught my attention because it’s unquestionably beautiful but at the same time, it is awesomely coded and designed. It’s also solid but fluid, with a great performance and full of customizable options, but very very easy to use and a pleasure to work with.
To sum up, not only a very beautiful template but a great coded theme.