Upgrade From Entity Framework 4.1 Code First

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I have a framework built around EF 4.1 using the code first strategy.
I am trying to weigh the pros and cons about upgrading to the latest version.

Since we are using the code first approach, I don't think it should be that big of a deal, but is it really neccessary?

Personally I avoid upgrades unless they are necessary. I don't like to upgrae just because the technology is available.

A couple of other things to consider:

It seems version EF 6.1.2 is targeted to VS 2012 and VS 2013. We are currently developing under VS 2010. At some point I'm sure we will be upgrading to 2013, maybe we should wait until then.

Our backend databases range from SQL 2005 to 2008 R2.

We are also utilizing Unity Version 2, which we are also considering upgrading.