Lucy is not a perfect device, but it is a good gadget if you need the motivation to drink more water and are prone to forget about cleaning your bottle. Pros: it does track water intake fairly well, automatic logging into an app is nice as it helps be mindful of your liquid intake. The water sterilization option is also great - it's hard to vouch for its true efficacy, but a bottle never gets smelly as reusable bottles inevitably do if they are not cleaned often. The top design is very cute and clover colors are intuitive regarding what Lucy is currently up to and how much charge it has. Cons: it's quite clunky and fairly bland looking overall, which isn't that big of a con really, I just wish it was a little more elegant or came in various colors. My first Lucy actually bugged out very often and eventually was deemed defective so I got a replacement. So far it is working well, although if it is disconnected from my phone for too long it loses its pairing capability and needs to be reset, which isn't great. The need to charge it every couple of days is a bit of a hassle, but it is understandable given how much battery Bluetooth can drain. Overall, if all you care about is a sterilizing option there are more energy-efficient alternatives on the market, but tracking water intake is a great plus if that is something important to you.