Attaching the pickup wires to the connectors is a bit finnicky and requires patience, but it beats soldering. Once you get a feel for it it's extremely convenient to be able to (dis)connect pickups in a matter of minutes.
As i also changed my pickups it's difficult to describe the exact effect the electronics have had on tone, but the pots are completely noiseless in comparison to what was installed stock in the guitar. The range of the volume and tone controls is drastically improved. Way more dynamic.
The harness itself is a perfect fit for my stock Made in Mexico Telecaster. Easy to mount on the control plate, with enough spare nuts, washers and ferrules for the knob shafts. A Switchcraft jack is also included.
Highly recommended.