Just received mine. Overall it is absurdly quiet and cool but unfortunately I did encounter the issue that everyone on this thread was talking about. One of the fans has a fairly loud resonant hum at the lowest rpm. It would be really annoying but thankfully the Gainward software allows you to control over the individual fans (kind of, it gives you 2 controls, with one controlling 1 fan and the other controlling 2 fans together). So essentially what I done was increase the minimum speed of that one problematic fan to 1272rpm and then the resonance completely disappears. This does mean the GPU is ever so slightly louder at minimum speed but I left the other 2 fans at their default minimum speed of ~1150rpm because they don't have the humming issue so overall the GPU is still whisper quiet and I'm very happy with the noise of this GPU. I'd probably be frustrated if I had to increase the minimum speed of every fan, but thankfully I only needed to change the one and it's honestly barely even noticeable.
Temps are VERY good. Like I don't think I've seen it above 60 yet even at 100% gpu usage. It usually maintains a solid 53-55 during AAA gaming, which is even more impressive because my case cooling is pretty average.
Coil whine is pretty much non existant on my unit. Even on 3D Mark Sky Diver with 700+ fps there's only a slight coil whine (which is to be expected at that framerate). During normal gaming at 200fps there's no coil whine.
The RGB is very nice, with good customization in the software including brightness controls which some manufacturers don't include for some bizarre reason (looking at you Zotac).
Overall I'm happy with the card and it is very quiet but it is silly that one of the fans is actually quieter at 1272rpm than it is at 1150rpm. That resonant humming makes using 1150rpm a complete no-go. It's very distracting but thankfully in my case I was able to solve it easily. One potential worry is that this could change in the future, perhaps worsening and maybe even becoming an issue for all the fans.