So, I received my Dekoni Elite Hybrid pads (for Hifiman HE series), and I installed them on my Venus headphones. First - the install is a bit difficult - these pads are built for a headphone with noticeably less ring diameter than the Venus. Obviously, you have to remove the plastic insert (the part that 'locks' into the Hifiman series headphones). Then you have to carefully manipulate the flap of leather while stretching the earpad from the inside (quite a lot) to finally get the pads to install.
I'm listening to them for the first time now, but first impressions are that there is significantly more smoothness to the mids/upper mids/treble response coupled with slightly better resolution and instrument placement (listening to "Symphonic Sondheim"). I'm really not noticing much, if any, change in bass extension or response (the graph led me to belief I'd lose a couple db there - so far that's not been a problem). I do wear glasses usually, so perhaps the same db bump in the lower bass area is keeping these fairly consistent with the stock pads in this respect.
The overall impression is increased resolution/imaging coupled with a smoother frequency response from about (I would guess) 800-900hz and upwards.
The pads are physically a bit more comfortable given the velour against the skin - hopefully that will mitigate the sweat issue with the stock pads. On the other hand, the ear 'holes' are 10mm smaller, so you will feel these around your ears (unlike the stock pads). So far, they've been comfortable overall, but I don't have much time on them at all yet.
On the negative side, the pads I received are noticeably different in 'thickness' - one is much thicker than the other all around, as if production 'stuffed' one much fuller with memory foam than the other. I'm contacting Dekoni about this as $70 earpads shouldn't have this kind of variation.
More later...