Hey kac,
Open ground "ball fields etc." I find the Superfly to work very well. My only complaint is its more sensitive to EMI but I am able to compensate for that with settings. I love how light it is. I could feel the difference in weight and balance while using both it and the Viper at the beach.

Minelab Equinox 800, Nokta Fors Core, Garrett Carrot