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If you need to justify upgrades I would recommend measuring build speed savings in teams - vs 2012 & vs 2013 build faster than 2010 in my findings.

Anecdote: for one C++ solution I work on (two projects, 300k SLOC)

VS2008: 5 min

VS2012: 15 min

VS2013 Preview: 10 min

I use VS2012 and I'm about to use VS2013 for .NET development, but our C++ project is stuck in VS2008.

C# solutions on the other hand builds way faster (in my experience).