I like how easy it was to create reports, as well as customize them easily using variables in SQL Server 2012 stored procedures. The help files are very thorough but sometimes hard if you're not familiar with SSRS or coding at all! Sometimes there can be some lag time between when changes happen within your report (such as changing from one field value) until they actually get reflected into an updated version of said document/report - this makes testing difficult since once we make any change via code / variable values etc., these will only reflect after waiting several minutes before being seen by others who use those documents too. This has been solved somewhat now through "preview" functionality which lets us see what our new updates look like without having everything fully up-to date yet; however still requires someone else other than ourselves making edits so things don't always match exactly.