Kiinde system

Has anyone used this and is it worth it? I’ve successfully nursed & pumped for 2 of my babies and pregnant with third. I’m typically an over producer and donate milk as well. Trying to make my life as simple as possible adding a third baby in the mix. I got a sample of this and it seems intriguing but also wasteful as I normally would combine pump bottles of milk to fill a bag to 6oz to freeze or to store until I was making bottles for daycare. Anyone used this and did you like it or was it more of a marketing scam ? Pros/cons? Thanks so much!