Is there a package price? It seems as though there would be some redundancy of parts in there? Or does the THC run on different rails and rack then the physical z axis would?

What exactly is included in the THC other then the controller? I think its funny they put this in their online catalog then didn't include a pic of the actual parts:
"Some manufacturers are vague about what their height
control is. Some are a lot less ‘automatic’ than others.
Insist on seeing clear, understandable photos of exactly
what you are getting. The less they tell you about it, the
less you are probably getting."

What about the probe sensor? You need a physical Z for that right?