I have, and personally i do not agree with the LEDs as i think the benifits of them do not overcome the danger aspect i.e people becoming slightly complacent and light colours as james rightly said, and things of the like!
One other thing i noticed, it may be me just miss interpreting things, so please excuse me if im being a little silly here, but as people keep on saying, that if the LEDS get damaged in battle, or stop working, etc, then still expect the robot to still be live? I personally think that disregards the need for an LED, because regardless of whether the LED is off, the robot may still be live.
This is my opinion, and i dont think the benifits out weigh the hazards :S
Please excuse this if it sounds rather ridiculous.
Thanks
Grant