I love gadgets and when I saw a self-opening garbage can how could I pass it up? Often when I go to throw something away and I put my hand out in front of the scanner I feel like a Jedi using the force to open up the lid. Really, quite sad. I've had this device for about a month. It uses 4 D size batteries but I stuck in 4 Eneloop rechargeable AA batteries with adapters and it's been holding up just fine. It does have a plug for an AC adapter, sold separately, but I felt it just looks nicer where I want it without a cable. It opens not smoothly but in several increments so it's not ehhhhhh but more like ehh, ehh, ehh but it's still very quick. After it's open if you have to waddle over the bin for a few seconds you'd better do it fast because that sucker closes fast! I find it a game to do what I have to do but try to get out JUST before it closes. The one complaint I see often here is that the sensor doesn't reach out far enough. I'm incredibly shocked every day at how people lack the most basic problem solving techniques but are quick to complain. The sensor does not shoot out an infrared beam continuously. It does so periodically. If you just happen to move your hand 6" away right after it shuts down it won't open so people get frustrated then move their hand closer then complain about how it's not sensitive enough. It's not the new proximity that triggers the opening but it's that next infrared beam that picks it up. It works fine at about 6-7" away, you just have to hold your hand there if you missed it and the frequency is not long at all. Just imagine you're commanding it with the force to open and it'll open in no time. A 13 gallon bag fits nicely but oddly doesn't reach all the way down even with all the coaxing I did at the collar. Because of its narrowness when the garbage gets to the top the bag is still not completely full which suits me great since my high rise garbage chute doesn't like a full bag. The only reason I gave it 4 starts instead of 5 was that the steel sides seem rather thin. In fact the entire mechanism was shipped inside the bin itself and a part of it seems to have banged against the wall leaving a small dent protruding out the front. I feel like if I threw something hard in there it would dent out the back side so I'm gentle with heavier garbage. Other than that it looks and works great.