Well, at first I was disappointed after I brought a defective Select cartridge from them and it just tasted burnt all the time. I knew it is had nothing do with my batteries, they worked just fine with other cartridges. Anyway, I was concerned that they might would give me hard time and won't exchange it. But I was wrong, the service is outstanding and it was quick. They replaced defective product with other brand and I am impressed. Definitely will come back again.