Thank you and sorry for late responses... I've very busied(for release new game and talk on Unite 2017 tokyo) https://www.slideshare.net/UnityTechnologiesJapan/unite-2017-tokyocunirx (Session slide at Unite 2017 Tokyo / in Japanese) But all of them have been completed. I'll start to work improve UniRx again. Curretnly not supported/tested on Unity 2017. I should check it quickly. Wait for a moment. Now, async/await supports requires `ENABLE_MONO_BLEEDING_EDGE_STANDALONE` define. Maybe its define removed on Unity 2017. If you add own ENABLE_MONO_BLEEDING_EDGE_STANDALONE define, maybe works.