I haven’t used VAX so I can’t compare but as a user of JetBrains other products (Webstorm, PyCharm, IntelliJ, Android Studio) it is very easy to pickup Resharper. Resharper had some major issues with indexing before but now the indexing is fast. The latest versions are also fully UE4 aware for things like UFUNCTION/UPROPERTIES and generete implementation for Client/Server tagged functions.