I say mask fans are worth it.

I've been using V-Force goggles since I started playing, but in Michigan, where I live and play, it can get pretty humid in the summer and condensation build-up becomes a problem. Fed up and after some research, (including the undergroundmodshop) I put my own fans in my mask.

They have made a world of difference while playing. I play with a friend who has the same mask I do and while he has condensation build-up while playing, I don't with the fans running and haven't since I've been using them.

Since the condensation is always inside from face body heat and sweat, I put the fans in where the vents are between the lens and the forehead as to pull cool air in. They make a little noise, but not enough to hamper my hearing, or give me away on the field. They are just two little 25mmX25mmX10mm cpu fans connected to a 9v.

Hope my input helped some.