I recently used this wiring harness to install a JVC KW-XR810 head unit in my 2002 Acura TL S-Type.The wiring harness worked well and was easy to use. It was nice that all of the wires came pre-cut and ready to strip. The packaging also had a wiring guide on the back that explained what each wire’s purpose was. This was helpful because all I had to do was match up the corresponding wires from the new head unit harness to the Metra harness.To be clear, you technically do not need to purchase this harness. This harness wires to the wiring harness for your aftermarket head unit and then plugs into your car’s wiring harness. The benefits of this wiring harness are that you do not need to cut into your factory wiring and that you can do all of your wiring while you are seated comfortably at a table inside your house and then just connect the plugs in the car. So, while you don’t need this to do the job, it is definitely worth the money for the convenience and for the reduced chance of failure.One thing I must point out is that this device is only wired to support 4 speakers (front L & R, rear L & R) so if your car has a factory subwoofer (i.e. a fifth speaker), this wiring harness will not support it. Also, I’ve looked around and there is not an aftermarket wiring harness out there that does support the subwoofer. Rather, what you have to do is run a RCA out of your new head unit and splice it into the subwoofer line for your car. There are plenty of “how-to’s” floating around on the web. I was able to find one for my Acura TL and I have the factory subwoofer working now.Overall, I would recommend this. It works perfectly and is great for the price.-Cheers!

Well made, easy to read diagram.

Had no issues installing. Made my installation much easier.

Great item

Thanks