Just received my 8 hemispheres. I gotta say that my expectations was way down, i just didn't know what to expect. The type is durometer 30 for 2 to 4 lbs. i'm using 4 with my Jbl lsr 305, which weights 10.12lbs.

The sound is definitely better now. i'm impressed on how the desk is much quieter, even when driving the speakers on max. It's almost impossible to feel any vibration from the desk.
Regarding the sound, stereo image is now wider, Transients and low end response tighter, more analytical. For 40 bucks this was a huge improvement on the sound.