Cewl, nah, just that I think it said with the documentation that you won’t be able to join any non patched servers once you install the patch, if it’s not there, it’s at least in many problems posted here within the past few days.
You could have two installs, one with the patch and one without if you wanted to visit both types of server.
Or, you could look at patch selector that some people have suggested, I haven’t looked at it yet… should really give it a try at some point.
RTFM = Read the friendly manual 
TBH = To be honest.