Hi Chris,
I have an HDS EDC U60XR and use the annoying stock bezel up carrying clip. I yearn for an aftermarket clip permitting bezel down carry, as well as fitment potential for a carry tab like the McGizmo clip (parts available at Shoppe). I've heard the Arc 4 clip is a superior item but never got around to getting one. This is one of the most glaring weaknesses of the HDS for carry potential: personal preference, but I cant stand the clip! I usually pocket carry it, but now with the new 2x CR123 tube its a bit ungainly, dramatically increasing the need for a good clip. If you are considering it, making a really nice bezel up or down clip would be a home run design, dozens of guaranteed sales for this one. More popular than Mac's MiniHIDs, I reckon.