I love NOT having all my compost in one bin!  I was always frustrated during the downtime with one bin. This makes so much sense because once you've filled side A, you can start on side B whilst side A "cooks."  So practical.  I gave 4 stars because I have a few issues: the openings that slide outward get stuck, so much so, that I have to lift the center edge with one hand and push/slide outwards with the other (slightly annoying); I wish it came with a tray underneath to keep the area tidy. All that being said, it is a handy, compact urban composter that I would buy again.