I used to use a pad, then I discovered the plastic blue thing and used that. Then, one day everyone was using the pads and I couldn't find the Manta Ray, so it was just the iron vs. my traps.
It didn't bother me, so I kept squatting the same way for the next few weeks. The growth on my traps was better than anything I've experienced with shrugs, although, I still do shrugs.
I highly suggest you start lifting raw. The benefits are worth the extra effort. Any extra "tool" in your arsenal is just another way of robbing your body of another way to grow more powerful.
-Warik