Sure. The first issue I came across was that the relay compiler expects a strict specification when mutating data, one that wasn't compatible with the server li

Sure. The first issue I came across was that the relay compiler expects a strict specification when mutating data, one that wasn't compatible with the server library I was using. Expect to write your own server side scaffolder to get around this. The second big issue was that relay modern decoupled the networking logic, so having a series of chained queries is something you either have to handle yourself or write your own networking logic for. And because creating dynamic queries can't be done with relay it's a bit annoying that this logic isn't handled automatically for you. My biggest gripe happens to be the lack of flexibility around dynamic queries. You can't define the data you want back at run time, which feels defeats a major point of GraphQL. Apollo supports dynamic queries with higher-order components. It might be a case of the grass looks greener on the other side, but I felt as soon as you try to do something bigger than a todo app with Relay you start to feel the restrictions.