I try new helmets back to back frrequently due to a love of ventilation.
The Smiths are HOT, and I've got two friends that gave up on them due to this issue.
And dozens of interweb reviews that speak to this issue.
YMMV
As noted above I own and love 2 of them. I bought the first because of how lightweight it was. Side benefit was the huge improvement in airflow over my previous helmets. However, the models I have don't have the Koroyd (the honeycomb material) in all of the vents so perhaps that is the difference. You're correct in stating YMMV which is why I posted as a rebuttal to your original statement which was posted as fact.