Does the NoVibes 3 leave the 5.25" bays completely wide open, letting all the sound insulation of the case escape? Anyone think that's kind of pointless? Why wouldn't they design it so the drive bay can fit over the frame, allowing you to close off the open spaces around the bay? I used some sound insulating foam to close off the empty space.
Below is the SPCR review, as you see from the pictures, the "NoVibes 3" product does nothing at all to stop airborne sound, just vibrations. This product will allow the 5.25" drive bay on the front of your PC to stay in its usual place so you wont see the HDD from the outside of your PC.http://www.silentpcreview.com/article39-page1.html
The drive that you are considering using this product with depends on how much a difference the "No Vibes 3" will make.
Please post the case that you have and the drive you are planning to use "NoVibes 3" with and we can advise you further.