[Mark Yacavone]

Data loggers are not unique to Stock, fellas. They've been around for decades in the higher classes. They've filtered down into Stock now, where some actually believe they are a requirement to be competitive , thus further raising the bar away from an entry level class.
I'd have to say the special, trick ring packs that fit the standard 5/64th , 1/16 grooves etc. are a significant Stocker technology.