Mirror on helmet - Fred or Fashion

I do not ride with one.  Why?  Maybe because if I am going to get hit, I don't want to see it about to happen.   I have been spooked a couple of times but 99% of the time I can glance down or hear somethign coming behind me.  I guess I personally don't see the benefit of a mirror. 

I would assume that for most people it is a comfort or piece of mind issue.  I don't judge those who do.  So if you feel safer with it...by all means wear one.

I wouldn't put a mirror in either "Fred" or "Fashion" categories, call it FUNCTION.  Always good to know what is on the road behind you.  Yes, I can usually hear the car as it gets close, but I feel better when I can watch to make sure the driver isn't doing anything erratic.  My cyclist friend wears one all the time, and nobody would accuse him of being a "Fred". 

Now, if I were time-trialing and in a position to finish with hardware, I might be tempted to ditch the mirror for the race.  Alas, since I rarely race and have plenty of other improvements to make before I place, this is kinda hypothetically speaking advice...

Oh that's nice....

This might be a dumb question, but are there mirrors for the handlebars?  I suppose those might get in the way.  I don't have either, but was thinking about one for training.  I worry that the mirror on my helmet would bug me for some reason since i'd have to angle my head just right to see behind me.... as opposed to something static on the bike that I could just glance down at.

I used to have a mirror.  Found it useless, and took it off.  I train in mostly rural areas though, so traffic is almost always a non-issue.

My dad has one, however, and he really liked it...till it fell off and he never got around to putting it back on.

I have a Rhode mirror that sticks on the helmet with a glue patch.  I think they are sold under the Blackburn name now.  Like this one: http://www.pedalpushersonline.com/?CID=1055

Many other models out there too.  This is the only one I have used and I like it.