I ordered Clayton Acetal Polymer Small Teardrop, the Black Raven Small Teardrop (which I think is also Acetal polymer) and the Ultem Tortoise Small Teardrop all 0.8 mm
I have tried them all. I am used to the Ultem but needed to compare with the Acetal.
Ultem is more warm acetal is bright specially on A and E strings.
Now the question is why is the review by Claytom suggesting that Acetal picks are for guitars while Ultem is preferred by mandolin players.
All these picks are great in my opinion.