I actually deal with yohannes more than two months ago, It was relatively simple to DIY. So far, I have done my four doors (metal side), roof and boot. I didn't do for my bonet because I already have a 10mm insulflex on it.

Closing door sounds a bit more solid now and there are lesser noise intrusion. The only unwanted sound intruding into the cabin in my car right now is the B-pillar part, something which this product won't solve because it involves the usage of either foam or thicker/extra rubber. Most happy part about the car? The roof. After doing it, the sound it makes when knocked on is like heaven and earth. The noise when the rain drops on the roof is significantly lower now.

Later when sem break on September, I will do it on my fenders.

Total used:

4 1/2 piece

1 piece for two doors
1 1/2 piece for roof and A, B, C pillar (beneath the plastic panel)
1 1/4 for rear boot.
3/4 piece for rear bench