Few Questions

Do you, in general, use Quadras to type\ find it easy to use when typing?
Are Quadras a valid way to Classify the types?

The article above:
Is it valid? True to your experience with the quadras?
What fits and doesn't fit with your evaluations and experiences of the quadras?
Would the Article be useful if it was cleaned up a bit?

I ask these because Quadras have become my new interest, and I'm thinking about trying to make the article more useful, but if there isn't any point to,'s better off not done...