I've been developing a few extensions for Visual Studio and have been consuming the VisualStudioWorkspace.WorkspaceChanged event. This event doesn't tell me anything more than "Document X has changed".

The AnalysisContext API looks like a much richer experience. (I haven't actually built any Analyzers myself). It appears to allow analyzers to wait for compilations, semantic models for individual files and more.

Waiting for a background compilation to have completed sounds particularly appealing to me. I don't want my extension to be responsible for triggering unnecessary compilations. I'd be interested to hear from other VS Extension authors who have also used the VisualStudioWorkspace.