Is VMWare Fusion bought through the MacUpdate Spring 2012 Bundle a full valid version?
In addition to the answer of Diago, I got this from the MacUpdate FAQ :


  What's the catch? 
  
  There isn't one! You get the exact same versions of the apps as if you
  paid full price! The same support, update, and upgrade options are
  available to you, as well.


So, yes! Buying the spring bundle will give you a full valid version!