I have just got one. Great was able to press my watch to take a photo.
Got two Skagen ones (which is owned by Fossil I believe). The software is a bit buggy but other than that I would recommend them if you dont need the advanced features of an Android/iWatch. Battery life is pretty good as well so no complains if you need it only for notifications.
As a watch it seemed okay but not particlularly as a smartwatch which I imagine is why most people would buy it
More likely a poorly written/supported app. There's plenty of documentation on how it can work: https://developer.apple.com/videos/play/wwdc2014/701/