Well Deb... without the MLCS in hand to compare, I can only talk specs and appearances.
The MLCS is an 8" arm, the LV is 12". This would permit larger free hand work w/o removing it. How significant that is will vary from user to user.
The MLCS appears to have a fixed pin, the LV has a spring, should clearance be a problem.
The MLCS has 1/4, 5/16, 3/8 & 1/2" pins, the LV has 1/2, 3/8/, 1/2, 3/4" and a pointed tip for tracing patterns.
The LV has rod is clamped solidly in the arm with zero slack. I cannot speak of the MLCS though the toggle clamps I've seen have varying amounts of wobble when they aren't pressing firmly against something.
The MlCS appearsto be made of welded metal, though I cannot tell how ridgid it is. The LV is made out of cast aluminum and the fin-like things you see under the arm is not a decal; they are molded structural fins. Structurally the LV is made like a tank; I've no doubt you could drive a truck over it without damaging it. Again, I cannot speak to the MLCS.
I've nothing against the MLCS, in fact I mentioned it! It also strikes me that, with the right equipment and enough care in alignment, it could be shop-made.
