I also have similar experience as mosen. In long run, rubber coating wiill wear and become cloddy on the surface. Also breach of the surface makes it feel sticky and ugly. This happened to my Desire Z in few years.

But I'd still say that rubber coating is better than glass surface. For example my Oneplus X (w/ Sailfish), both sides of the phone feel like glass. You can use the phone as a spirit level; if the surface isn't completely even, the phone will slide and fall down The phone is way too slippery and only usable with rubber covers.


However I wouldn't be too excited about any covers on Pro1, because it's difficult or impossible to make proper wrapping to a slider phone. I mean, if you just need grip you can use a rubber backcover that covers only the keyboard part of the slider, but then it gives no protection if you drop the phone accidentally. And if you make a protecting cover like Otterbox for n900, it will greatly increase the thickness of the device so it won't fit to any pocket anymore...