There are only 2 real negatives to it... The cost (including the light and the holsters), and the pain to find a holster to go with it.
I did a poll on this very topic a while back, and the numbers voted for no light. However, the logic outweighed the votes in that one. It's the same reason we carry guns "better to have it and not need it..." The minor negatives I listed are far outweighed by the pro of having an extra very light tool with you.
I did a poll on this very topic a while back, and the numbers voted for no light. However, the logic outweighed the votes in that one. It's the same reason we carry guns "better to have it and not need it..." The minor negatives I listed are far outweighed by the pro of having an extra very light tool with you.