i use my sphex stapled on some cheap soft mouse pad. that way mouse doesn't hit a hard surface when i lift it and put it again on the surface while playing and you benefit from both hard surface and the soft pad beneath it. since hard surfaces gives you alot more smoothness (especially with mouses that have bigger skates), this is the best combination i've had. it's almost frictionless.
i recommended to try it
but my sphex kind of wore off and i'm now looking to buy a new thin surface which is larger than sphex and hopefully single colored. can you guys recommend me one? (i'm hoping to use it with my g400)

http://s7.postimg.org/qva5q2w5n/20150406_005714.jpg

http://s15.postimg.org/itdqoic23/20150406_005813.jpg