I've been experimenting with these recently.(I'm sure others have done so as well, bt it's new to me.)
I really like the sound of these, and they match my ProPik and BlueChip Thumpicks very nicely in tone, volume, etc.
I'm sure they would match plastic thumbpicks as well, because the blades are made out of re-tweaked thumbpick material.
There is virtually no "squeak" or "chirp", and I'm choosing these as my recording picks as of late.