Forum Moderators: rogerd
In looking at the description of the .18 release, it appears they addressed mostly bug fixes, though they mention a few security items as well.
I am still planning on doing the upgrade, but I will wait until I have sufficient time. I would recommend upgrading, not least because if a later security-related bug is found you are often forced to do the prior upgrade in a hurry before being able to fully patch the new bug.