I'm not a fan of soldering so I decided to give this solderless harness a try in my new partscaster. It's a very crafty design, there is a small dial which you can use to set the desired resistance for each of the pickups separately, either 250K (single coil) or 500K (humbucker).
Instructions were quite simple, but after I assembled everything I got no sound. I checked every connection with multimeter and disconnected and reconnected everything. It took a while to find the problem: the output jack connector is very tight and there is a step before the input jack is in place. I thought I had the cable connected because of this, but in fact it was only in the first step and I had to push it ever further down.
Aside from the unusual input jack design, my only complaint is the quality of the quick connector for the pickup wires. It doesn't feel too sturdy and if you try out new pickups often, it might not last very long. The switch also has a bit of play in the lever, but works well enough.