Interesting that you should ask this question tonight. I had a student who decided to use this technique this evening. This is not the norm for most of my students as the more advance folks use graded fiber; however, in this case it was vc paper. We used 2/3 of the time at the highest contrast range with 1/3 at the lower value. Then "tweak" from there.
The best thing is to play with the various methods and use what best suits you. This tool seems to work with negatives of extreme contrast ranges (at least in our lab) and works regardless of which contrast is exposed first. Have read several variations on the theme. Just as is mentioned in the above post.