I just got the XL pads! The feeling of comfort on them is night and day compared the stock pads; it's really quite amazing.
The change to the sound is quite miniscule. I do believe the soundstage is slightly improved. The bass has lost a bit of punch and instead feels a bit muddier but it's hardly noticeable.
Also, it's a lot warmer due to the extra contact on the skin.
Protip, if you want to look like a jerk, put the old stock pads on top of the XL pads and wear them that way!
I really wish the design on removing and replacing the earpads was designed better; there were a couple moments where I thought I was going to rip my old earpads and leave the plastic catcher still in there.
Edit: After I removed the earpads, I tried to see if I could gain access to the driver (more specifically the driver holes) by removing the screws but the plate in front of the driver still wouldn't budge so I just gave up on that.
Edited by Semont - 3/10/14 at 5:19pm