I like how easy it was for me as an admin user with no programming experience at all (I'm self taught).
The UI makes sense once you get used too but there are some quirks here or over time if something isn't working correctly when using one of our clients products/services etc then we have issues getting them fixed quickly so this can be frustrating in itself! It's not perfect by any means though - they do keep coming out with new features which may take longer than expected however sometimes these aren’t fully tested before being released into production environments leaving us without options until after launch date unless someone wants ot go through testing themselves. We use vault primarily because its integrated very well within other systems such AWS S3 storage buckets also Cloudfront CDN service where content lives from different sources including CMSs & WMS providers.