Given the choice, get the STF-2. It'll save you some money, and it's basically the same as the VTF-2 but not switchable. (Which most people don't do anyway.) I personally have a VTF-2 (they didn't make the STF-2 when I purchased it). I, as most owners do, have it set for max extension. That's what the STF-2 is permanently set at.