Does a silicone cutting board really work well?
I would expect a silicone board to be quite keen on scratches as it's soft. The same applies for plastic ones.

I've found the best chopping boards are those made of wood. They are also safer. 
Some kind of woods, like bamboo, are natural antibacterial:


https://www.ncsu.edu/bioresources/BioRes_08/BioRes_08_4_6501_Xi_Qin_Antibacterial_Perform_Natural_Bamboo_Fiber_4310.pdf
http://www.tandfonline.com/doi/abs/10.1080/00405000.2011.614742#.Ve2BQBHBzRY