I don't understand why it works so well but as very long time coffee drinker (I started off during the percolator era) but by far this best coffee maker I have e er used. I have tried drip coffee makers, French press, many different brands of k-cup machines, but I have never er had a better cup of coffee. The brew time is short. It only takes about 3 minutes. What you get is good express strength coffee, but it is easy to elite it so that you get what you want. To make additional cups you can make more (up to four) espresso strength cups or you take another three minutes and brew up go for more expression cups. Capacity is on problem. The taste is better than anything you can imagine. As advertised there is No acid taste; no matter how strong it is. .y only complaint about the clear model is that measuring guide numbers on the outside come of quickly. You are better off with the smoked plastic versions. It is the same device but the numbers last !longer. A!so it is worth buying the pressure. That way there are no problems with the size of the grounds. Finally the metal filters are very easy to clen. As with rest of the parts a quick rinse is all that is needed.