Just received my pair of Air Pro 4 but encountered two very disappointing issues: constant electronic noise when playing music or using ANC, and unacceptably high noise floor.
Earbuds make this scratching/beeping sounds when music is playing, so any moderately quiet song becomes unpleasant to listen to. The noise floor is very reminiscent of old bluetooth headphones when technology was only starting to advance, of course it's unimaginable that something like this should be a problem in 2024, but it is, and it's very disappointing.
That was my first experience with Earfun too.