I am primarily a FoxPro 2.x developer but am trying to convert over to
Visual FoxPro OOP.  I've done some small OO projects and have become
increasingly aware of all the neat things that can be done with class
frameworks.
Considering my relative inexperience with developing a class framework, I
have taken notice of the many commercial Framework packages available.

1.  Does anybody have experience with any of these commercial frameworks:
Visual ProMatrix, Visual Extend, Visual FoxExpress, Codebook 3.0, Mere
Mortals Framework, or MaxFrame?

I have been considering Visual ProMatrix because it has alot of builders
which will help me get up and running quickly yet will this eventually limit
my efforts when I become more proficient with working with classes.


2.  How important is it to know the Visual FoxPro Codebook 3.0 framework?
I've seen alot about products being "codebook compliant/compatible" and
there are many employers looking for codebook proficient programmers.
Whould a commercial framework like Visual FoxExpress be a good medium
between having RAD builders and being codebook compatible?


3.  Can Commercial Frameworks be mixed?  ie. Could I use one framework that
has a lot of builders and then later integrate other features from other
frameworks (hopefully without too much hairpulling)?