After waiting for over a week (the phone has been available for pickup since the 14th!) because I wasn't sure if I wanted silver or gold (gold is what I had ordered), I ended up caving in and just picked up the gold one.
It's a lot faster than my 5s and I also enabled wifi calling. I had to call AT&T to do that because the phone wouldn't let me do it. The AT&T rep said it's because I'm using the SIM from my old device. Anyway, after about 15 min of time with AT&T I have it working.
I do find that the body has a slightly more textured feel than the 5s and and is also a bit yellower (both attributes of the 6s as well).
The speaker quality does not seem to be as good as the 5s, but it's still acceptable.
I don't seem to have any yellow bands, but I definitely do have buttons that rattle very noticeably. But it doesn't bother me.
Hopefully there'll be no major bugs/issues and I will hold on to it beyond the 2 week return period! I have had bad luck with my last 2 purchases -- a rMB which froze while setting up, and a 6s that had some weird defect that would cause the screen to flash while checking voice mail.