Pedantry corner here, the STC (Suspended Thrill Coaster) might as well be a subclass of the SFC (Suspended Family Coaster). The only major difference between the two is the STC has inversions. Note the first line on the Vekoma STC page of their website:Na Fianna Force is an STC, different model than the SFC.
The Suspended Thrill Coaster is a suspended family coaster-based design that is running extremely smooth and has an exciting layout with no less than 3 inversions, multiple airtime hills and exciting twists and high-speed turns. This ride will thrill the seasoned rollercoaster enthusiast but is equally fun and accessible to the youngest among thrill seekers with a minimum height restriction of 1.20m (*) and up. (Height restrictions may vary based on the layout)