I have used these evaporators very successfully at mine sites where I have worked in the past. They are an extremely reliable unit and worked above expectations in the environment where we had them set up. As for spray drift/mist this can be controlled by the weather monitoring systems that are available with the units. Additionally, how you set them up and the amount of fall you can achieve allows for more moisture to be stripped from the droplets]will greatly benefit your overall evaporation rates.