I love my RF-602 Yongnuo triggers, they have changed my life
HOWEVER they are as loose as a loose thing on the hotshoe and have no locking mechanism on either the receiver or transmitter. I managed to catch my 580EXII as it fell off the stand once but it was a close call.
Do any other users have any tips or mods that might be helpful? (and don't say 'should have bought PWs'...)