Great product for measuring your coffee automatically and consistently. There are 3 buttons, which can be programmed for different dosages.
If I were only doing automatic coffee, I'd say this is an expensive add-on. For those interested in having the convenience of 3 different doses, it is great. Much better than doing scale.
Perhaps the one thing I don't agree with is that the design of this Esatto takes away the ability to get a sample dose. This is useful for determining grind size, which is highly dependent on bean type, bean quality, brewing type, bean age, etc. I use one of my dose settings at 1g to calibrate the grind size... I just dump onto white paper to measure the coarseness.