The M Tech Framelock A/O Spectrum knife is the fourth MTECH knife in my collection. I bought another one because of its excellent design, with a spring-loaded flipper mechanism that allows for very fast operation. The knife is very sharp right out of the box, and after sharpening in the Spyderco Tri-Angle Sharpmaker system, it's super sharp. It's also handy, fits in any pocket, and is very inexpensive for such a good tool. It has many other advantages, but only those who decide to buy it will appreciate them. ;)