The bin is more oblong than square but it fits nicely so not a real problem. The senor in the lid picks up that you are passing even if a little away from the bin and as they are near to the entrance of the kitchen I can see the batteries running out quicker. Having to place them there, (yes I bought two bins, one for general and the other for recycling) as they shouldn't be near any light source or microwaves. We will have to see if it drives us mad with them popping open every time. 
The only other quibble is that the bin lid seems to be made out of plastic rather than the metal as described in the product details but from a distance they look smart. I think we will have to wait to see if I would recommend them to a friend. [This review was collected as part of a promotion.]