You will find a lot of people even on Bladeforums who will say the Tenacious is no longer "relevant" given the variety of quality knives offered at the same price point. For me, it is a question of all the design elements of the Tenacious coming together in a way that I really like. Full length cutting edge, neutral handle that you can get all the way up to the cutting edge on, but safely without undue risk of slipping up on the blade, a blade shape and geometry that has a great balance of strength and cutting ability (though I tend to regrind mine for even more cutting ability at the expense of some strength), negative blade angle for added leverage, a locking mechanism that is quite strong, and very user friendly, including easy to use left handed... Combine that with the fact that I detest flipper knives (which seem to be invariably the types of designs that people tout as "better" than the Tenacious) and you have a knife that, while some may turn their noses at it, will work, and cut and work and cut, and feel great in the hand doing so.