I've had nothing but problems with YO harnesses. They are cheaply made and the pins break easily. They also don't fit right in. The ones I worked with had plugs that fit way too tightly for the cheap pins to go in without breaking. They might be fine if you redo the whole car but if most of your harnesses are factory and you try to add the YO, in my experience, you'll regret it.

Painless harnesses are a HUGE pain. You have to wire the whole thing yourself. They label the wires but there is effectively no harness. You can save a ton of money by just getting rolls of colored wire if you want to do it that way.

Call Bill Evans at 814-864-2622. He makes his own and gets my highest recommendation.