but I had two products sent and both had a weird humming noise, focus hunts a bit too

Also, it makes quite loud noise when it does it

I started shooting only primes because I hate the low light color noise from my zoom lens

so I could film my gardening videos on my 70D Canon EOS 70D Digital SLR Camera (Body Only) without the loud autofocus noise I got from non-STM lenses

If it's constantly trying to auto focus, the noise drives me crazy

Also the noise occurs even while recording in manual focus while you twist the ring

Motor makes a funny noise when trying to focus but will not focus

Within two months started to make a very loud clicking noise when trying to focus

You will likely have some grainy noise in your images too; it’s not avoidable.

It performs great a s a walk around lens as well, though you dont have a zoom range like on a traditional walk around lens it gives great wide angle shots as well as close ups second to none