It's easy to use, has all features that you need in logging system (such as event-based or file-oriented) plus some extra ones like searching by tags/fields etc., it supports multiple logs from different sources such as SQL Server 2008R2 & 2012 with native integration of Microsoft SqlServer Event Viewer so there are no additional tools required to connect them together, nothing at this time! The UI could be more clear but I think they will improve soon since its still young product. We have few problems during our tests when we used File Based logger - sometimes files were not written properly due to network issues or server crashes which caused problem while working with eventsource. Also if your application uses both sqlserver database + flatfile then using two separate databases would cause performance issue because each db needs own connection pooling mechanism. Using Eventsourcing approach makes us.