i had this dilemma recently and eventually chose the hex. The xar is nice but more bulky – it seemed to fit lower though, and would not happily accept my joystick light fitting without the inside bit of the lamp mount pressing on my head. In the end i got a hex again.
The rounder shape of the hex fits me better and I also couldnt really see / feel the benefit of the extra cash on the Xar
The new hex with roc loc 5 feels a lot better than the previous version.
If i was buying today though i would probably go for the fox flux on Stif. Down to £42 and looks quite cool 🙂