Sorry, for the slight thread resurrection, but I just noticed this thread myself and thought I'd put my two cents in as a Wellograph owner.
First off, on any platform (Android, Windows phone, etc), this is only a "fitness / health-focused" watch. While some features may be added in the future, for the time being you will get *NO* notifications or updates on the watch regardless of what phone you connect it to.
With that out of the way, those that still pick up a Wellograph watch will find that the watch appears quite well-made and feels solid. Their website lists the watch is made from stainless steel, aluminum, and sapphire for the screen. I can't say that I have beat mine up that much, but it seems capable enough of withstanding some punishment at least.
For what it does, the fitness stuff, it seems to work well and the data matches up relatively closely with other fitness tracking device's. I did have some curious / possibly incorrect data with the sleep tracking. However, maybe that was just me or my particular watch.
As far as the Windows phone compatibility, I was able to connect the Wellograph to my Nokia Lumia 635 running Cyan (WP 8.1). They do have an app in the Windows phone app store, but as mentioned above, they may be focusing on other platforms first. The below are screenshots from each of the supported platforms (Android, iOS, and Windows phone). As you can see, the Windows phone app hasn't been updated in quite some time and the others have received a steady stream of updates.
Android Wellograph app:
Apple (iOS) Wellograph app:
Windows phone Wellograph app:
None the less, the below screenshots are from the Windows phone app. They give you a good example of what the Wellograph will currently do on Windows phone...
As you can see, you can access the data from the Wellograph and see a history of what you have done. I'll keep an eye on this thread, so if anyone has any questions, post them up!