These things are an 11/10
Every serious headphone enthusiast should have these pads to swap out on any cans they'll fit, because they really have the potential to enhance sound due in part to the larger opening. What they did for my modded t50rp mk3 was amazing:
-big time sub-bass extension. i can hear 20-24hz clearly now, whereas with any other pad setup i had trouble making it out until about 23hz
-soundstage, definitely widened
-there's less bass impact, than with brainwavz hybrids, but that's possibly due to less of an unwanted midbass bump
-mids and highs are just as clear as before, but they hit you from more angles which makes for a more tingle-inducing experience
Comfort is exceptional. They are angled (hard to tell in the pic) quite perfectly for me, with no wasted space between ear and driver.
I can only imagine how they'd sound on a better pair of headphones.
Overall pretty significant soundstage increase, tiny bump at 1k but from then on darken the headphone up a bit. using them on grill-less HE-500, but would be a perfect match for HE-6 users who think treble can be a little over exciting.