Here's the deal. Pros and cons. Does it work? Yes. 100% as advertised and works well.
Is it hard to instal? That's not a yes or no question. If you can turn a screw driver and spend some time on you tube. Then you can do it. And do it well.
But if you expect this to be a plug and play deal go pay someone to install it. But you will miss out on fun and pride you feel when you do something yourself.