As AF mentioned, the Sage 2 is a somewhat older (almost ancient in the prod. folder world) Ti frame-lock design released before over-travel stops, LB inserts, and bearings were all that prevalent. You may not know it used to be commonly referred to as a "poor man's Sebenza" before the market was inundated w/average, to very good $100 to $200 Ti frame-locks.
This particular knife is one of my very favorite and most frequently carried folders, and after just under 5 yrs of moderately heavy use, and not being especially careful in releasing the lock-bar...it's strength is fine. It still exhibits "like new" lock-up (I believe mostly due to Ti's inherent tensile strength), and the lock-bar movement across the bl. tang is maybe only 2% to 4% greater than when new @ approx 40% at present.
Probably not the hi-value knife is once was but in all sincerity, and after many other similar knives have since passed through my hands, I must say the streamlined (inside lock-bar relief ), low parts count Sage 2, w/it's elegant looks, great ergo's, and velvety action is still a tremendously satisfying knife to use.
Didn't mean to ramble but...damn this is a great knife.