This cup started out great-5 stars. I could microwave the water in it, drop in the infuser with the loose leaf tea in it, steep it with the lid and enjoy. This worked about 5 times and then I noticed that it was leaking out of the bottom of the cup. I discovered an actual hole in the bottom of the cup. I have another kati cup in a different design and it has what looks like a plug in the hole in the bottom of the cup. So I it looks like my spring grass cup lost it's plug or was somehow defective. Very disappointing because the design is great and my other cup works fantastic.
I love this new cup/infuser. I received an all-green one as a gift and bought a spring grass one to go with it. Being able to use the right amount of loose tea in a single cup/mug is great. I like the insert on the spring grass one best--it's solid, not a mesh, like the all-green one. Also, the holes are small enough that I don't have finely cut leaves drifting down into my mug. The only caveat/warning is that the cup gets very hot. After you pour in the water, move it to where you want it and then make sure that you wait until the cup can be picked up without burning yourself.
This cup makes a perfect cup of tea! The steeper is great. I love the cover which helps keep the heat in while the tea is steeping. (I hate lukewarm tea!) An added bonus ishiw the cup fits perfectly in your hands! I bought as gifts and I'm about to buy more for other friends.