I will probably take heat for this as many people do not believe the painless harnesses to truly be painless. I rewired the entire car from scratch using a painless harness, and it turned out incredibly. While I was at it I relocated the battery, and beefed up the entire electrical system. I was quite easy with some limited electrical know-how, and allowed me to wire in a variety of power hungry accessories. If you're running a lot of modern aftermarket items and using the car as a driver I highly recommend this harness.
If on the other hand you're looking for a simple drop in, or originality avoid this one.