This review is for the Ratio 4. The wait is finally over and well worth it! I saw the demo at the SCA in Portland and was chopping at the bit to get one. The size is perfect. My first cup was outstanding, very smooth and balanced. I used a bright Kenya, and I was able to taste some fruit notes and plenty of clarity. I did a side-by-side comparison with the Fellow Aiden, and I found the Ratio 4 to be the better-tasting cup. I prefer not to deal with settings. I highly recommend this brewer. You get the benefit of a pour-over without the hassle of timing, and it has the built-in bloom feature. It does it all for you. I can now retire my Ratio 6 since it is larger than my needs.