Ecobee and Flair

Yes, ecobee is integrated into ST as it has extensive APIs available.

There are many options to integrate your ecobee3 with SmartThings: you can use the ST stock device, there is another open source version, and there is my version which exposes all ecobee3 features to ST (including the remote sensors).

I ask for a contribution for my version as it took several months of development & testing to complete (more than 3500 lines of code)…

The benefits of my implementation is that there is an ecosystem of smartapps that come with it. See this thread for more details:

P.S. Also, I have already developed some smartapps to integrate Smart Vents with ST and ecobee. See this another thread: