I agree, Superlux wouldn't have made the expense of developing an entirely new pad just for the heck of it. They obviously did their homework.
I guess what pad "improves the sound" depends on what you're after. ANY pad rolling will change the sound, regardless of the headphone. It depends on what your individual preferences are.
For example, on the SHP9500, I've pad rolled about 10 different pads (everything from velours to pleathers to hybrids to DIY silicone-coated pads). They all change sound in different ways. I wouldn't universally come out and declare that "pad x is best", because my hearing and genre tastes are different then others'. If I was a basshead, I would not think velours were "the best", but perhaps rather pleathers. If I preferred a flat sound, I may not think hybrids or sheepskins were "the best".
Honestly, I hope generic silicone pads are made available by 3rd parties at some point. They will just become 1 more useful pad to add to an audiophile's pad rolling arsenal. They won't be for everyone, just like pleathers or sheepskins aren't for everyone. And they won't work well on every headphone (just like velours or angled pads). But they will work for some people on some headphones, and having more choices in audio products is more important than anything IMO.