I have the series 3. I use the Sync Solver to send and receive data from my fitbit app. This allows me to ditch my fit bit. I like being able to see my messages on my watch without having to pull my phone out of my pocket and unlock it. We use an app to pay for parking throughout the city. It sends me a notification to my watch, but doesn't to my phone. This means when my meter is up, it lets me know, and I can pay for more time. Super helpful. I also use the flashlight a lot when in an attic. I have a protective screen, so its protected from scratching but is a little more bulky. All in all, I like it.