Demon, Dart or Duster instrument cluster & heater control

i need to install a new wiring harness in my 73 duster 340. The original one finally gave up the ghost.
I know "Painless" is a popular brand but their price sure isn't painless.
I'm looking at a product from EZ2Wire. It's their 14 circuit harness for half the price of "Painless".
Is anyone familiar with this brand? If so please give me feedback.
Also, I have never installed a wiring harness. What am I in for? Any advice?

You can see the harness I'm interested in at ez2wire.net and model # KW14STD. Thanks, Doug