EDIT: It's also WILDLY inconsistent. Click and drag on a button and the shape doesn't change. Click and drag on an on/off and the deformation follows the mouse. Merely click an on/off and the deformation does not follow the the little circle thingy, or bear any relation to the action of the button.
Some of the things are inoffensive, spinner dots, progress bars, accordion menus. But basically anything that deforms on click related to where you click are nonsense.
EDIT 2: The buttons in the demo area apparently do have distortion that follows the mouse, but on the left side they don't? For me this is just a lot of bafflingly inconsistent gloss that makes me wonder what's going on or why one thing behaves differently than others, and what that means for actual functionality. Rather than just interacting with the UI.
very important to filter out and choose who you engage with