Not bad
The switch on/off button ux is not great. so small press can switch it off. may be they can make it sliding switch or something else so that it can toggle only with human interaction. Overall the build quality is great. Its small enough for my cat. I am giving 4 star rating as it switched off yesterday and I didnt even know how did that happen. And that moment I was looking for my cat and a little bit tensed as well.