I think these cycling goggles are good value for money. despite not being able to take the arms off, they were comfortable, they didnt fog up, they kept the sun and bugs and things out of my eyes and the rose coloured lenses didnt darken my vision too much when the sun started going down.
They are pretty much tight around your eyes like goggles so nothing gets in, although I did get a bit sweaty. All in all I like them better than traditional sunglasses style because the strap stop these bouncing around on your face and you can do what you want without them falling off.