If you haven’t seen it already @Alyc100 has done some awesome work integration this with smartthings.
The system protocol is proprietary and basically the system is not mesh capable so central placement of the hub is important. The biggest thing going for them is that the cheapest devices are way better value than smartthings equivalents but they are stateless. They also have some great looking light switches which again are good value for money. More expensive plus devices and the valves are stateful as they contain transmitters.