Upgrade to 53, 54 or 55

Hi folks,

In order to fix a couple of issues we are having we have been told we need to upgrade from 48 to version 53.  But we can see that 54 and 55 is now available.  My question is if any of you other folks are on any of these newer releases and if you've had any problems?  I'm trying to read everything I can and discuss before making a decision on which version to upgrade to.

Thanks,

-Patrick