I've owned 5 Terzuola folders (3 TTF-1s, 1 TTF-3 50th anniversery version, and a Cen. Starfighter). All but two of them had a nasty habit of inadvertantly unlocking. One of the TTF-1s locked well and stayed locked as well as the TTF-3. If your gonna get one it might be helpful to get it from a dealer who has an inspection/good return policy. Other than that though the designs are attractive; and theres no denying that B. Terzuola is the grandfather, so-to-speak, of the "tactical" folder genre.