Here's what I know, the training is expensive, and it assumes that you have a basis in normal vocal production. I would pick up a copy of "Singing for the stars" which is Seth's book. It includes a workbook of exercises as well as a CD that has him going over the exercises with you.
The technique primarily focuses on eliminating the Passagio, or Break. When you hear people talking of "Mixing" they are usually referring to the area of your voice that this type of training stresses.
I think that any good voice teacher will be able to give you the improvements you seek. Vocal Production is something that has been studied for thousands of years. There is no Magic bullet that eliminates all problems. What works for one person and their individual bad habits and problems will probably not work for others.
I do ,however, think it is interesting that people have cast this method off as one that is for Community Theater, and one that would make it difficult for you to withstand the rigors of an 8 show week. The whole theory behind this method of singing is to reduce fatigue and strain.
Other than that, did you enjoy the play Mrs Lincoln?
