I have used Mesosilver myself, and it has cured my pneumonia & terrible chest colds last winter when used with my nebulizer. I bought a gallon of it last year from the company for a deep discount. I've got enough left to get me through the coming winter.
I want to get away from opinions to avoid controversy. There is nothing like lab reports & documented research to strip away the controversy, lies & marketing BS.
I'm sure you will get differing answers from others.