Is there any tactile feedback like textures or bumps on the surface?
Yes. There are braille-like dots, or raised dimples, at the center of each home row key. These let you find home row by sliding 5 fingers on the surface without looking down. There are no tactile indicators on the other keys. If you learn to reach the proper amount for them and then spring back to home row, you can really ‘touch’ type (without looking down).