I saw this piece to fit perfectly on the shoulders that connects to the sqauting bar at fitnessfactory.com it replaces the pad. Let me know it's better than the good ole cushion pad.
I like Manta-Ray, it's very comfortable. Before, I didn't use anything, but with years as weight on a bar got much heavier, it's nice to protect the skin.
I currently am using the Manta-Ray and it works great for me. If I did not have access to it at my gym I would probably buy one. However if it was me I would see if my Gym would be willing to buy it. That would be an accessory that allot of people would find useful.