We've owned an Eckstein CDI 120-3 since March 2021. Even after more than six months, everything is working perfectly, and we have fantastic softened water. The salesperson seemed very professional and didn't pressure us to buy immediately, unlike the salesperson from another well-known company. If you can do without the fancy features of the app, I can highly recommend Eckstein. I check the salt level once a month; I don't need an app for that.