Here is my honest review.
20m of big D for my preve, 5 meter small D, 5 meter small P.

One month plus into my usage, safe to say it feels like 10-20% improvement only. On the first week after installation, yes it is amazing.At least 80% improvement. A week later it starts to degrade to now what feels like 10-20%, or maybe even worst. Because noise of bike and trucks are louder now then in stock form.

Was it worth it ? no for me. The original rubber of my car is now squashed. So that means if i took out all the D and P's, theres a chance that my sound insulation will be worst then before.

Be prepare for very VERY HARD to close door for the first 1-2 weeks of installation.