https://www.healthline.com/health-news/heres-how-well-covid-19-vaccines-work-against-the-delta-variant
Good info on what we know so far about vaccine efficacy and Delta.
Real world, I am seeing it spread among younger kids and I have had several breakthrough cases (for all vaccines) this weekend in my clinic alone but all breakthroughs would be considered mild cases. The unvaccinated seem to have more significant symptoms per age group than before. For example, most 20-30 year olds with the old variant had symptoms akin to the common cold. That same group presenting naive to the virus and unvaccinated now have more flu like than cold symptoms. Our hospital has fit middle age people with Covid misrepresented in the ICU vs 6 months prior.
I was pissed when the media and Fauci made a big deal about the previous British, South Africa and Brazil variants because they were not significantly more virulent than our original variant. Now we have a case of the "Boy who cried wolf" and our partisan divide has left people blinded to the shit show that is happening around them. Maybe they'll have an epiphany when their hunting buddy is found lying on the couch gasping for air with his 55% O2 saturation but by God, they can't force me to take that experimental Biden juice.