Guys, let's not allow the troll to turn this thread into a 'made in USA vs. made in China' thread! The OP asked about why Spyderco (not other companies) is so well liked and well respected on the forums, and he deserves answers.
Basically, Spyderco was first to bring to market many of the things that make folding, tactical knives appealing, and they did this all back when other production companies were not willing to take the risks that Spyderco did. Spyderco introduced pocket clips, One-handed (non-auto) openers, ATS-34, and G-10 to the production knife market, decades ago. They have continued to innovate to this very day. Their Owner/Founder is one of, if not, the kindest, most approachable person in the knife community.
Also, Spyderco, while making some of their knives in their USA factory, and having the rest made in Japan, Taiwan, and China, is a 100% American owned and operated company!
Regards,
3G