Hi,
A Proma THC unit is about $150, so the THC unit itself is not too bad pricewise.
The problem would be that your controller (PMDX 416) would not be able to utilize it.
If you decided that you did want THC, and it has been an absolutely must have function with any of the tables I've had anything to do with,
and you bought a THC unit like the Proma but then found you had to replace your controller as well, that becomes expensive.
If you used a Hicon Integra controller you would be 'future proofed'. The Hicon controller bare, that is without the THC unit and the software
activation, is $600. They are good quality units but they do come at a premium.
Craig