I don't mean an investment in the sense of monetary value. I mean an investment in time (mine the pun

)
I got mine through Vitality. I've been very active before so reaching the goals doesn't bother me much.
I'm a big watch person, so wearing it was no stress. The step tracking (I was wearing a fitbit/jawbone plus the watch) it's good as it eliminates one thing off my wrist. To be honest I use it mostly for fitness/exercise/running and for that it serves me well.
For fitness it's great, as a watch also great, reading email, texts, getting reminders, appointments adequate. You need your phone close by at all times, but I have my phone and watch together anyway. (Cool things though, on your home wifi, the watch can connect and receive and respond to messages without the phone, you can put music on the watch and listen using BT headset from watch)
All depends what you want from it, but I'd recommend it.