I agree with Ralph. The vang was one thing we got rid of right away. As cruisers we found it to be an a nuisance. We have the traveler mounted in front of the dodger so it is not needed except for off wind work and for that we use a preventer. We also have center hatch and store the dingy on top which it also hindered.
But for day sailors and weekenders I can see the convenience of a rigid vang.
Jim