I haven't used a Cool Zone, but I'm wondering what your source of cold is.
looks like you pump cold liquid through the jacket.
seems like an excessively complex and expensive solution for cooling a single fermenter to me. unless I'm missing something you would need a jacket and pump for each fermenter you want to cool.
adding the cost of even a cheap sub-pump, some way to chill your chilling water or glycol, temp controller, thermowell, etc. I bet you can get a used fridge, temp controller, heating pad combo and chill 2 or more fermenters.