davoid
Android Expert
The Goliathus has a fabric 'control' surface, whereas 'hard' or 'speed' surfaces are smooth. The Sphex sounds like an oversized screen protector that sticks to your desktop, so it's probably closer to the latter than the former.
My Sphex definitely can't be described as 'smooth' - it's more like the surface on the side of a box of matches that you strike against... nothing like a screen protector. Definitely textured, like coated glass paper.