Echo Busters or Room Tunes?????????

Hi. I've been looking at these for acoustical treatments. I have Martin Logan electrostatic speakers and I've been told by a few other Martin Logan owners that the Double Busters - "Diffusion & Absorption" work great behind the panels and possibly throughout the room itself. Any information on how to use these and what others have thought of them would be greatly appreciated. Is there a difference between Echo Busters and Room Tunes? Any info where I can purchase or demo these would also be appreciated.Do they ever come up used?? Is there a possible way to make my own? If you can save a little money, you can save a little money. Thanks for any help in advance and Happy Thanksgiving to all.