I mentioned wearing a full faced helmet in my last post and thought I'd make some comments on it (using the good old pro vs. con format).
Pro: Safety. Safety. Safety! If I have an accident it should keep my beautiful face intact. (ha! ha!)
Con: Reduced peripheral vision as well as reduced hearing (at lower speeds). I've had a few cages sneak up on me, especially when I first stared wearing a full faced helmet. I don't recall ever being snuck up on wearing a half helmet.
Pro: With the tinted visor I can make faces at people without inciting a road rage incident.
Con: I look like a lollipop.
Pro: Protection from road debris. In my area there's lots of construction, and there's nothing like being behind a gravel truck only wearing a half helmet (ouch!).
Con: No wind in my face -- I feel a little isolated from the world around me.
Pro: Comfort, when it's below 50 degrees a half helmet sucks (ear flaps or not).
Con: Comfort, when it's above 100 degrees a full face is down right miserable (the vents don't seem to have much effect at all).
Pro: I can listen to my iPod through my helmet speakers.
Con: I can listen to my iPod (then I really can't hear what's going on around me).
Pro: On long rides the full faced helmet reduces fatigue.
For me the pros outweigh the cons and I will probably continue to wear a full faced helmet. Next time I ride through a bee swarm I'm sure I'll be happy about my decision.