2 doylle
It doesn't have a delay with ctrl+Z , im using shader material not the 'show DX in viewport' option in the default material.
It can be used for models also.
Here are some other shaders . Though mine is based on a default shader in Max .
These are much more advanced: they allow normalmaps and textures + spec to be show in your viewport. Worth checking out.
Ben Cloward - Character Animator | Resources - Shaders