I was an installer for this product for close to 20 years.
I still have good things to say
That is i never had one fail.
And even seen roofs where every nail was installed incorrectly and it didnt leak.
But i still need to present this evidence.
Where there is just little algae resistence
And the cap shingles have unsealed but not failed.
Site wont let me post a 50 second video.