It's very good, I like it because of its simplicity when using in house databases (SQL Server) or any kind external database with ODBC connection to connect to them.
Sometimes can be slow if you have large amount of data but that is normal since every ETL tool has this problem so not really an issue here. If your looking into doing some integration then go ahead and try! Also there are many tutorials out their which will help show how things work under hood once setup correctly. Using SQL server as source system.