Not a problem, whatsoever. My "favorite" one of all, actually -- including over the original one purchased (new) last summer.
What exactly does the term "favorite" imply in this context? Loosely, I would say:
- Screen Hue was beautiful
- Battery life seemed exceptional
- All buttons were tight and responsive
The 5K(s) suffer
a bit on my first 2 points above, but not the 3rd -- the buttons are fine.
Not a real big deal -- and don't get me wrong here: I'm
not whining about the 5K replacement(s). But y'know how it is: when you're in a situation whereby one has two identical device models to compare within weeks of each other -- one can't help but notice some slight differences.
Kudos though, as they've all been cosmetically clean as a whistle on the surface. They look like they're pulled out of a retail box. Sparkling clean -- as Apple always does -- with the new glass/antenna band/etc.
I'm just chiming in since you brought it up.