This product is exactly what I have been looking for. It allows me to brew using loose-leaf teas. The tea does not have to be put in a filter or diffuser ball. The pot can be used for both cold brews and hot brews. The built-in filter allows pouring directly--without straining.
The price is great.
One negative point is cleaning. Once finished, the tea leaves cling to the inside of the pot. I suggest rinsing the pot and pouring the old tea leaves either through a bag used for vegetable waste or pouring them into a plastic shopping bag with holes to allow the water to drain.
I have bought two and will likely buy more as I would like to try making dashi.