Supposedly it’s more of an issue with the Studio with the Max processor.
Not with my M1 Max on the base Mac Studio.
I just picked it up from Costco yesterday and plugged it in a moment ago. It is not absolute silence but neither is there any irritating fan noise, coil whine, nor other annoying frequency emanating from it. I used a sound meter app on my phone to measure the following:
1. With nothing turned on in the room, I get a minimum reading of 27 dB and average of 30 dB
2. Windows 10 tower PC on the floor, idling at the desktop measures minimum of 35 dB and 36 dB average
3. Mac Studio 1-foot away from me on the desk measures minimum of 29 dB and average of 31 dB
I am the only one home, working from a bedroom with the door closed. I held the phone in front of me at the same height and position for each test and measured for at least 10 seconds. I don't doubt there were some noise issues with early Mac Studios but, IMO, it is far from a widespread problem and is very likely overblown.
I am still setting up the Mac Studio but have absolutely zero qualms bout it from a noise standpoint. If I put my ear right up to the case I can hear a gentle whoosh, not really a hum. From a foot away I have to stop and concentrate to discern the sound of the Mac Studio fan versus the sound of my own breathing, that's how quiet it is. Once I organize my desk and place the Mac Studio in its true location 2-3 feet from me then I'm sure to be even less likely to hear it, if at all. Even 1-foot away from me it is not an unpleasant sound in the slightest.
I really don't know if I'm gonna go through with ordering that 32GB M2 Pro Mini now. I've already grown quite accustomed to the front USBc and SD Card ports.
EDIT: Okay, ran into my first annoyance -- lack of storage. In my excitement I wanted to test the TB4 speeds transferring photos and videos from my 1TB Sandisk Extreme Portable SSD. The Sandisk was only half full but I forgot the Mac Studio only has 512GB storage (less so after the OS and installing a few apps). I really would be more comfortable with at least 1TB internal storage. Just not sure if I want to order an M2 Pro 32GB/1TB or base Mac Studio with 1TB. Adding storage really kills the $1699 deal on the Mac Studio. Since Costco has a 90-day return policy, I'm going to give it a few more weeks (or months) to see how much the limited internal storage bothers me. I suppose I could just permanently keep the SanDisk drive attached instead of upgrading the base Mac Studio. The SanDisk writes/reads at about 1GB/sec, not as fast as current NVMe drives but not too shabby.
Sidenote: The fan in my Windows 10 work laptop, also 1-foot away from me, easily drowns out any perceptible sounds coming from the Mac Studio. I am sure the M2 Pro Mini is quieter than the Mac Studio, but from first-hand experience it's not really a concern or differentiating factor.