Hoo boy, I'm a Spyderholic, so I will try to keep this short. In fact, I'll outline it.
1) Spyder is thought to do a pretty good job of enforcing quality control of their knives wherever made (USA, Japan, Italy, one was Swiss, Taiwan, and now even China).
2) That said, most Spyderholics prefer USA or Japan (Seki City) knives. And that is because (1) fit and finish are great; and (2) US knives use S30V and Seiki knives use VG-10 or ZDP-189. All top "super" steels.
3) The Tenacious, made in China, is their first and only (very controversial and very inexpensive) Chinese-made Spyder. Opinions are fiercely divided about the Chinacious, as I call it. The steel it contains is OK, nothing to write home about. Spyderco's president, Sal Glesser, basically said he had to compete with all the other brands going to China, or see his company go under. So some people see the Chinacious as supporting the company so it can continue making high quality Am, Jap, and Euro knives.
4) Make your decision about what knife to buy, based on the design fitting your needs, and the
steel it contains. The "S" uses 440C, which was considered a good steel 20-30 years ago. Still is good, but things have gotten so much better in the past decade. I've sold all my 440C knives because better options exist. I'd consider 440C a minimum acceptable standard.
5) Do you really want to be cleaning goo out of the blade? Decaying stuff on the blade will stink. The knives in the same ballpark as that S in size and function, that get big raves, are the
Dragonfly, and the
Caly III. They can be had with high end steel, and in the case of the Caly III, even with ZDP-189, an amazing super-steel.
6) Merkava is joking. You don't want a Gerber. I will get flamed for what I'm saying next, but it's true: Gerber uses low-end 440 on a lot of their knives (don't know what steel's in the Gator so maybe I am speaking out of school). I owned several Gerbers. Nice to look at...but...very bendy edges.
7) If you decide to go for the Native (highly rated due to its top quality steel, myself I don't like hollow grind), a new model is coming out that has everyone hot and bothered--it has a flat ground blade (=good!). I am waiting impatiently for the
new Native 4s myself. Interestingly the photo shows a VG-10 blade, meaning this would be a Seki knife. Traditionally the Native has always been a US made knife. So maybe the prototype you see in the photo was made in Seki? Don't know.