Not having much experience with anything other than the standard issue system avatar's head, I am extremely grateful to Catwa for their (her?) generosity in offering what seems to be a "state of the art" head to introduce us to the joys and sorrows of working with one. Over 17 years, I've become so accustomed to the system head (and skins therefore), I'm enjoying the challenges and frustrations of learning this new device.
The Catwa HUDs seem so cryptic because they cram so much into so little screen space that having a thorough guide at hand is always necessary. This stuff is dizzyingly complex and makes me realize just how user-friendly the Linden controls really are, frustrating as they have been in the past. Of course, if Catwa did not have to struggle with the current limitations of HUD construction, who knows how much better and easier to use they'd be?