I wear glasses so a fan is a must.
nice and small
easy 3 minute install (dont know what these other people talking about hard to install. Snap visor off, snap fan on, snap visor on. No biggie.
Little bit loud, and have noticed that its easy to accidently turn it on like when putting goggles in goggle bag etc.
I will rate the fan an 8 because it is a little loud and the fact that it turns on accidently might leave someone stranded without a battery. Would be better if it used a AA instead so that way its more of a common battery.