Did you try the paid data? The free one missed most the trees, but the $2 map showed all the trees in my nearby park. Really impressive.
They should offer some other way to trial the full version.
The sample convinced me. $2 is a really small investment.
They could probably have a side-by-side comparison of somewhere famous like Central Park (I'm from UK, fwiw) showing the free vs paid data to give an idea of what one might get; I guess it varies by location how much detail is mapped though, and how recently.
I’m very happy with the results. It confirmed my guess that a specific section gets more light over the year even though there is a bit more shade in the mornings until late spring.