Provides an extension to the native PDO along with a profiler and connection locator. Because ExtendedPdo is an extension of the native PDO, code already using the native PDO or typehinted to the native PDO can use ExtendedPdo without any changes.
Lazy connection. ExtendedPdo connects to the database only on method calls that require a connection. This means you can create an instance and not incur the cost of a connection if you never make a query.
另外是 Profiler 的能力，需要用的時候應該會很好用：
Profiler. An optional query profiler is provided, along with an interface for other implementations, that logs to any PSR-3 interface.
引一下來源，當初是從「Atlas.Orm 2.0 Is Now Stable」這邊在看文件時一路看到的。