I was working with Polar M200 this week and I must say, it's amazing experience. Watches feels very robust and durable on hand, the GPS is working very well. It collects lots of informations for Polar Flow app and shows lots of statistics.
Providing HR zones for better training results (including your own custom zones), it may tell you to move if sitting too long. Instead of customizing watchfaces, you can customize sports profiles you want to track and to any sport profile you can customize data displayed on screen. It also works with favourite running applications (Runtastic, Runkeeper, Endomondo) - you can add Polar M200 as HR monitor and it will provide HR data to the app. M200 is water resistant and you can swimm with it on your wrist. Polar Flow dashboard can also prepare special plan for you to start running (5K, 10K, halfmarathon and marathon) - just fill up som input data, deadline for your marathon and it will calculate (and watches will remind and guide you about your trainings.
Notifications works good too. It has the problem of trimming text on circle display with quite large font. But you get the info, ast sportwatch is not for reading mails, messages and interacting with them. Battery life is similar to Pebble - about 6 days (including 6 hrs of GPS training), there's also no need for special charging cable. Watches unit has incorporated USB connector, so you can put it to any standard USB hole).
Polar M200 is great choice for sportfans, fitness people and runners, bikers etc. Can be bought for 130 €, which is almost the same price of Pebble 2 and without app hangouts, connectivity problems, also includes built in GPS.