Painless Wiring Harness for 73 Dart Swinger

I'm in the process of completely tearing apart and resto-moding my 73 dart swinger. I may or may not run an electric fuel pump, and I've considered an electric fan set-up, as well as an electric water pump... but again, it's all still in the design phase.. Car is stripped clean inside and out.

Has anybody installed a painless wiring harness (12 circuit) like the one offered in summit? (#10127, http://www.summitracing.com/parts/PRF-10127/)

I can only imagine that it would work perfect, but I just wanted some user input.

Thanks