Inexpensive, cute, and it makes nice coffee when you use it right.
Negative Product Points
A certain amount of trouble to use. Water has to be the right temperature.
I used this daily for about two months before moving to a (Starbucks) automatic drip machine. The Yama is a nice little product and I may still use it from time to time. I agree with the positive reviews that it can make nice tasty coffee and it's fun to watch.
But I stopped using it because it's too much time and trouble. The water in the lower chamber has to be at or near boiling when you put the top on, otherwise water rises to the top chamber that's not hot enough to extract properly. So either you boil water with a kettle first, or you have to wait and let it heat up in the lower chamber before jamming the top on. Then you lower heat and wait another minute, or whatever you decide is the optimum time, before pulling the thing off the heat. You can be doing other stuff, but you have to be there in the kitchen keeping track of the process.
Anyway, after two months of this the idea of being able to turn on a machine and walk away was impossible to resist.