Center for New Testament Textual Studies' New Testament Critical Apparatus
https://www.logos.com/product/32501/center-for-new-testament-textual-studies-new-testament-critical-apparatus
I noticed that the date on the product page is 2010, whereas Faithlife's main competitor carries a "Revised" edition dated 2014. Although I have been eyeing this resource, I am hesitant to purchase it when (1) a newer edition is already available and (2) if/when Faithlife does update their edition, historically the odds seem slim to none that I will be able to pay a small upgrade fee for the revised edition (Faithlife's competitor charges $29.90). With this sort of resource, I would think the older version would be obsolete if you also have the newer version, so I would not want to pay full price twice.
What am I missing here? Are my concerns valid or am I way off base?