After solving a few Hexafex I can say I like them but not as much as Sudoku. The puzzle area where you are working on is smaller than at Sudoku and you just have to count till six.
The objective of Hexafex is to place numbers one to six in 6 triangles around each circle in the Hexafex puzzle. I recommend you just visit their website to try one Hexafex puzzle. By the way every day the release a new puzzle. Happy Puzzling!