Alrighty, then. The overall impression that I have got when I switched to the Dekoni Sheepskin pads is that the headphones got a bit muffled in the treble region. It's nothing drastic, but it's enough for me to say that the Teaks lose their "specialness". The bass is also a bit lower, but that should definitely be fixed with the attenuation ring that's coming inside of this drop. I have tried making my own, and it made the bass bloated and it started bleeding into the mids. That's why I ordered another set of pads (pleather ones, this time) with the ring to try Dekoni's ring out, as I think it will be better.
So, overall, the sound is quite close, but it's just not there. If you love how your Teaks sound because of how sharp, accurate, clear and precise they are in the treble - you will like them less with the Sheepskin pads. If you find the treble to be a bit too hot, these pads might be perfect for you. Again, I don't know what the bass will sound like with the ring, but I'm listening to my Teaks right now without the ring (and the Sheepskin pads), and the bass is fine, honestly. If I had never heard the Teaks with their stock pads, and the Dekoni's were the stock pads that shipped with them - I probably wouldn't mind, but for me - the stock pads win in the sound department.
One positive thing about the Sheepskins and the reduced treble is that they tame a peak in the treble around ~10 KHz (?, don't hold me by my word on that, I might be quite off, but I'd say it's somewhere around there). While I don't find the sound offensive there with the stock pads, they can come off as a bit metallic sometimes, but in all honesty - I think that's because of my poor amp/dac combo (I have a FiiO E10K that I'm scrounging up the money to replace).
Also, I think that the sound is more natural overall with the stock pads (except for that peak with my gear), while it is a bit darker/warmer with the Sheepskin pads.
Anyway, I realize that I might have went a bit all over the place, and I apologize for that. If you would like more info - let me know! I am currently using the Sheepskin pads because the stock pads are just atrocious to use comfort-wise. I just can't. They're terrible.
Another thing that I tried and that works very well for me is the stock T50RP Mk3 pads on the Teaks. They bring the midrange up even more, make the sound even more natural, and are - believe it or not - more comfy than the stock pads. Not the ultimate in comfort, but better, and better sound. The only problem is that you might get a bit of sibilance when you crank up the headphones with them, but it's not that bad.