I have had the small version for about 3 months, and the large version for 5/6 months. I absolutely love this product! It allows me to do what i think would be called a “modified gungfu” type steeping. Basically do exactly what you would do with a yixing pot or gaiwan (1g/1oz of water, multiple short steeps) Its so much easier than using a yixing pot!
I will warn about making chai, the spice seems to linger longer than any other type of tea i have tried. Other than that, its perfect!