This is my first automatic trash can. I order it because I have 2 dogs that are night prowlers for trash cans. I wished it was bigger even though it doesn't need to be, for my own sake.  The instructions were not that good, this is why it received 4 stars. But I figured it out.  First my new out of the package batteries were weak so it only open and shut when I pushed the buttons in front. So, before you think it is broken change the batteries. 
It is easy to clean and I love the deodorizer once I figured it out. That was the instruction problem I had.  I read people have problems with the ring that you put the trash bag on.  It is a little flimsy and I am sure you could break it if not careful. But since I read that, I try to take care and pull it off before I take the bag out, which has worked fine for me. I use it in my kitchen and the size of the opening has been challenging, but overall I am happy with it.