I have developed an app using RxAndroid working together with Retrofit2.
I'm happy with the results. It help me with the asynchronous flow of the request and threading issues.
At the beginning, maybe you can fell a little bit uncomfortable with it. But with time, it's pretty straightforward.
There a really good talk that I really recommend for all you guys that want to learn how to use RxAndroid
#droidconDE 2015: Ivan Morgillo – Android reactive programming with Rxjava https://www.youtube.com/watch?v=JCLZ55M2gVo