I'm using Apollo with https://www.graph.cool, and for me as mainly a frontend developer, it has been absolutely great so far. I've used both Relay and Apollo quite extensively in the past, and while both have their pros and cons, I do enjoy working with Apollo right now. Apollo had the added benefit of existing for several platforms in roughly the same way, so I've had the pleasure of using Apollo with both React and Angular 2. Great work!
I just got to plug graph.cool too for people interested in GraphQL and Apollo. I've been using it for quite a while, and the platform has been working great. I've been chatting quite a lot with their support (hey Nilan if you see this ;)) and they've been very helpful both in matters concerning the platform, but also for my app and GraphQL in general. I really recommend trying it out!
I just got to plug graph.cool too for people interested in GraphQL and Apollo. I've been using it for quite a while, and the platform has been working great. I've been chatting quite a lot with their support (hey Nilan if you see this ;)) and they've been very helpful both in matters concerning the platform, but also for my app and GraphQL in general. I really recommend trying it out!