It is a cool looking black watch (that is the color I picked) with just one color to display, like a kindle (eReader). Because of this battery life is really good. Though it advertises of 5-7 days, I observed that 4-5 days is really comfortable. It connects to your phone using Bluetooth which means that your phone battery is gonna drain a bit faster than normal.
How it works is that anything that is a notification on the iPhone is displayed on the watch and apart from this one additional thing that can be controlled is the music on phone (start-stop play-pause). It has a small vibrator too so, if your phone vibrates, so does this (depends on what is set on your phone to vibrate).
It can support up to 8 apps (very limited but...) that includes watch faces and apps. There is an SDK (Software Development Kit) that will let you program it (not for the non-geeky kind). So, you can keep changing the watch face whenever your mood changes. Some apps that I seen are for running a chrono clock, score etc. Since it has a accelerometer, it can track your hand movement and so, comes really handy to track your calories and activity while running etc.
I own a Bluetooth headset too so this is the coolest feature is that I can put my phone in the bag and just carry the headset and the watch. The watch tells me who is trying to reach me and the headset to communicate. I keep my phone on vibrate mode most of the time without disturbing anyone. I can answer and reject calls from the watch too. Watch faces are just great and I keep changing them very often.
Overall, priced at 150$, I would say its worthy of the price. I am not too tech savvy about the features it has but this works for me, so I am good.
