Dekoni earpads arrived today, sodding £14 in customs fees to pay!
Anyway, spending the last hour or so listening to them and they seem fine to me. Because the inner opening is slightly smaller than the standard pads, the sound feels slightly less open I think, unsure yet if in a good or bad way, perhaps neutral, certainly not bad, but just different? It's excellent for acoustic music, for example, but perhaps not for gaming where a wider soundstage is desirable.
The highs and mids seem more or less on par with stock pads, the low down bass is slightly more present because of the memory foam.
The velour is not the same as the stock pads, this is less piled and the pad surface is more flat than the curved nature of the stock pads. The comfort level is good however. Still getting used to them and they press on the head slightly differently to the stock pads, the memory foam shapes to your head once warmed up unlike normal foam.
Pics:
As you can see, there is no change in pad thickness vs stock. Some people were saying the other models of the Dekoni pads increase thickness, thus changing the sound travel distance and colouring the sound adversely.