Especially important is the statement : Feel free to post your config here before you go live for advice.
Certain devices have no default protection, and depending on the OS they are running they could be compromised very quickly!
So before you hook this thing to Internet, check & double-check everything, routerOS release etc.
You don’t want to become a valued Mēris botnet contributor I guess 
http://forum.mikrotik.com/t/meris-botnet-information/151776/1