Upgrading a server-2008 domain controller to Server-2008 R2

Hello fellow Spice-Heads,

My home network is headed by a server-2008 domain controller box.

Interestingly enough, my other servers (Exchange, WSUS, Web Server, File Server) are all server-2008 R2 boxes.

I have not experienced any issue with the network thus far, however has anyone run into any "gotchas" upgrading a server-2008 domain controller to server-2008 r2?

Thanks

No, I have not researched this at all because I can always fall back onto the "It is not broke, so don't fix it" mentality!  :)

Just wondering is all.