impact of using SSDT with SQL Server 2008 R2 porjects / server

 Hello Experts,

My comapny uses SQL Server 2008 R2. We are currently not planning to change our database to SQL 2012 but :

We want to Create/update our SSAS/SSRS 2008 r2  project(s) using SQL Server Data Tools. We would also like to use SSDT for the current SSAS/SSRS projects.

Can you please guide me with the pros and cons of doing so? 

Thanks & Regards, Chaitali Thaker