I got both. Brainwavs XL sheepskin pads on my AD2700 (Ad2000 drivers in an AD700 frame):
They look pretty cool!
Here's the Dekoni sheepskin:
These Dekonis were absurdly difficult to install, and I'm a compulsive pad-roller so it's not like this is my first rodeo. Seriously frustrating, I had to stretch them farther than I was really comfortable with. They're not radially symmetric, because the AD-series frames are not. I had to use a paint marker to draw a line on the thinnest point of the back for reference. This is why they look all wrinkly and ugly in the pic, it's very difficult to get them lined up perfectly. Somehow the OEM pads do not suffer from this problem; neither do the Brainwavs, which have a much more generous amount of material in the "lip". Dekoni could have done better here.
The sheepskin quality is virtually identical in both the Dekoni and Brainwavs. Both are nicely put-together.
Sound quality is where the Dekonis excel. I bought these pads because I love the AD2000's highs and detailed, articulated bass, I just wanted a greater QUANTITY of bass without affecting anything else. That's exactly what the pads do. A+ in keeping the original sound and comfort, and making it hit just enough harder, providing exactly what I wanted from this purchase. The Brainwavs -- which, to be fair, weren't specially designed for AD-series frames, they're just the only ones with a large enough diameter to fit -- are so thick in the padding, there's a ton of added space between the drivers and your ears, so the sound is (IMO) significantly compromised. It loses the high frequency precision I appreciate the headphones for, so the gains in low-end quantity are rendered irrelevant.
The Dekonis also cost $20 more, which might matter to some people. To me, it's well worth it paying the premium. (The Dekonis were $60 here, the Brainwavz were $40 on Amazon.)