Kershaw, makers of decent to great knives of all sorts will tell you the same exact thing. Many of their folding blades have Torx screws, and as they lifetime warranty their wares they warn people against cheap Torx bits as they have gotten tired of customers having issues due to their using cheap "tools" to do rudimentary home service.

You don't need to go and by a military-grade NIST certified driver set....Husky makes some good Torx hand drivers.