Zvex pedals are the creation of effects pedal guru Zachary Vex and are assembled and handmade in Minneapolis, Minnesota. The company offers pedals that are either hand-painted or hand-silk-screened, the latter being a bit less expensive.
If there is a "flagship" Zvex pedal, it is the Fuzz Factory, which is a Germanium Transistor based fuzz pedal that, like all Zvex pedals, offers the user a wide variety of control. And also like other Zvex pedals, it offers true bypass switching. Another popular (and fairly odd) Zvex original is the "Lo-Fi Loop Junky" which purposely offers a less-than-perfect looped guitar sampe that sounds like it was recorded on a broken 1975 reel-to-reel player.
Zvex also offers more "traditional" distortion and overdrive pedals with the "Box of Rock" and "Box of Metal" pedals. Zvex also offers intriguing variations of other vintage effects such as wah, octave, and ring modulators. Few effects pedal companies have taken old designs to new heights (or lows, depending on your perspective) as has Zvex.
Another thing is quite clear - Zvex stands behind their work. All handpainted Zvex pedals are warrantied for the life of Zachary Vex himself.