I love them. Usually buy the ones you can get in Costco and other places. They come 3 to a pac, and are perfect for normal usage. I also like the baseball cap I have that, like Smoke just said, have led's in their bills. Biggest problem with them is their lower usable time since they normally have button batteries as their power source. But I have 2 of them and they are by far the most comfortable type. But my favorite ones are the type that have 2 red LEDs and three white LEDs. I use them for night fishing because I can turn on the red lights and not destroy my night vision like a white LED will. Extra important when you're in a boat at night with all the lights off.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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