I do a lot of crawling , climbing and reclining in the course of work . This can cause lots of problems with clips . Consequently I don't trust them for work . Off duty , with the flap of a cargo pocket snapped down tightly , it's less of a problem ... but I'm already acustomed to wearing stuff on my belt anyway .
The only exception is the very solid Ti clip found on the McGizmo lights . Problem - these are limited production lites , my Alum. version was about $300.00 . Currently Don only does Ti , as a result prices have gone into the $500-600.00 range . Thats a bit over my pain threshold !
Chris