FWIW, the price listed is the same as that offered for the upgrade path from an earlier version.....
I don't mind paying for an upgrade, as 1) it does not happen very often, and 2) TechTool Pro has proven to be an excellent product. While I do not have many issues with either of my Macs, nor with either of my external drives, I still use it to continually maintain my drives (SSDs for the Macs themselves).
In any event, even though that may be the same price as it costs for a current TechTool Pro to upgrade, it's definitely an excellent price for someone that needs to make a new purchase. And of course, it just makes sense for a current user to upgrade, and especially if one is using El Capitan.
