There are cheaper ones but imo I think the sn770m is one of the most efficient for a 2tb at 3.3v 1.8A as opposed to most others are 2.5A. just something to take in consideration if looking into the most power efficient. Seems like they only sell them at bestbuy in the US though.
Mine has it very badly. I suggest those that says they don’t have it or hear anything, it seems more apparent when there is some audio signal coming through so try playing something at very low volume so it doesn’t mask any static noise out and try focusing on it. If you’re just plugging in and not having any signal coming through then you probably won’t hear anything or have very low noise. More noticeable on earbuds than normal headphones as well.