Among 6 others I've tried this is the one that brews my tea perfectly and I believe it's because of its functionality and simple yet truly efficient design. Since it has a large capacity it ensures that the tea has enough room to expand and allows the water to perfectly steep the tea. I agree that its design promotes optimal water flow and this is what gives the tea its perfect brew. Most of all, it's very easy to use and fuss-free which is something very important especially for anyone who just needs a simple infuser that works. So far I don't see any negative side of it.