Erin Stellato (@erinstellato) of SQLskills shows how to use Extended Events to monitor for query plans with certain characteristics, such as joins missing predicates, columns missing statistics, and unmatched filtered indexes.
Joe Sack (@josephsack) of SQLskills.com shows us that we might not always be able to make an accurate correlation between wait statistics and observer overhead, depending on the method being used to observe a system.
Jonathan Kehayias (@SQLPoolBoy) of SQLskills.com evaluates the performance impact of query_post_execution_showplan and explains why you need to be very careful about using it in a production environment.
As you have most certainly heard elsewhere, SQL Server 2012 finally offers a version of Extended Events that is a viable alternative to SQL Trace, in terms of both better performance and event parity. There are other enhancements such as a usable UI in Management Studio – previously your only hope for this was Jonathan Kehayias' Extended Events Manager.