I have no issue whatsoever with the finish of the device's back.
The button area, however, uses a "soft touch" layer. That, because it happens to be glued on, I managed to kinda ruin a bit through excessive alcohol soaking ;p.
Not sticky, though, just wrinkled. Which just kinda gives it a grippy feeling, so, no real loss there.
EDIT: c.f., pic
here.
(FWIW, they got rid of that on the Libra).