Donating breast milk

Shelby • Teacher, wife, and mama to Jaide and Knox!
Have any of you done this?? I found an organization, National Milk Bank, and plan on donating 400-500 oz. I have 1,100 oz in my freezer and I teach, so I'll have the summer off and won't be using much of my frozen stash. This organization turns the milk into supplements for babies in the NICU around the US. Has anyone else done anything like this? I'd love to hear your experience. Thanks!