I wear glasses so a fan is a must.
nice and small
works well
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.
Weaknesses:
Little bit loud, and have noticed that its easy to accidently turn it on like when putting goggles in goggle bag etc.
Conclusion:
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.