Hi Brian
Generally, we use Sql Server Reporting Services.
We have customers with AX 2012 R1 and AX 2012 R2 with different Cumulative Update.
About SSRS, as datasource we use Data Provider. Give us more flexibility.
Finally, about analytic reports we use the BI Tool so Microsoft SQL Server Report Builder, Excel with cubes, SQL Server Power View, etc.
More informations at www.microsoft.com/.../details.aspx
Kind Regards