I think the Dekoni sheepskin pads are worth buying; they're an improvement over the stock pads in sound and comfort.
I've been comparing them to the stock pads for the past hour or so using familiar high-resolution classic rock files I've uploaded to Vox, via my iPhone 15 Pro and the Bathy's USB DAC. If I had to pick a short description to characterize the result of using the Dekoni pads, I'd say the sound seems cleaner and smoother overall, especially in the midrange (which has a bit more presence and clarity). The bass is also smoother; I think the Focal pads over-emphasized the bass and the upper bass and the lower midrange was a bit muddy. I don't hear any deep bass loss with familiar music having significant bass content, and the bass seems faster, cleaner, and harder-hitting. I don't hear any difference in the highs, but I do have age-related hearing loss and have compensated using Mimi at 30% (I did redo the Mimi equalization after listening to the Dekoni pads for a while, but the resulting graph looks the same as when I had the stock pads installed). The Bathys sounds closer to my Focal Clear than before (of course the Clear is open and the Bathys is closed).
And the leather pads are definitely cooler to wear than the artificial material of the Focal pads. There's no heat or sweat build-up at all. They're as thick as the Focal pads, even softer, and the replacement is perfect, simple, and secure (just be sure that you orient them properly by matching the two cylindrical pins on the plastic mounting panel with the corresponding holes in the earpiece panel, and then gently push down around all of the circumference of the pad until you hear clicks from the rectangular tabs and don't see the edge of pad's plastic mounting panel. The clamping force seems to be slightly less than with the Focal pads, and more comfortable, so maybe the foam inside compresses more easily. I like them so much I think I'll get a spare set. Plus they smell nice!