Two different Pure products are compared. Those with a rubberised surface and those with a hard surface. Only the rubberised ones have the problem that the softener decomposes over time and becomes sticky. When buying, check whether it is rubberised and then keep your hands off it. This should settle the question.
The surface is plastic. I have had the device for a few months and the surface is still flawless. I know the surface problems with rubber from other devices. They should not occur here.
I am very satisfied with the device. :-)