Got these for my SRH-440s. They're worth the money. The phones fit better, are more comfortable, isolate noise a little better, and creak somewhat less with these pads.
As if that weren't enough: It may just be wishful thinking, it may be the better isolation, it may be the new plug I had to install on my headphone cable at the same time (having smashed and bent the other one somehow), or it may be the foam covering the driver (it's thicker than on the stock pads, which probably provides ever-so-slight attenuation of higher frequencies, or something), but I could swear my headphones even SOUND better with these pads. And I didn't have the problems other people seem to have had with installation ? it takes a second and it's a little fiddly, but I read stories from people who said they failed for a half-hour to fit these over the phones, and that didn't happen at all.
I bought these ear pads to replace the stock ones on my Shure SRH 440 headphones. Although these pads are designed for the SRH 840, they fit on the 440 and are easy to mount. They sit a little loose, but they do not fall off. I use my headphones at home to listen to musik, for mixing and live at the FOH, so they have to take some beating every once in a while. After using them for almost one year, no wear can be seen. The new ear pads have increased the comfort of the SRH 440 to a new level compared to the stock pads. I can recommend them as an upgrade for the SRH 440.