I have the Dekoni pads for the TH900, but they are on my HE6 and that is where they will stay.....I have a second pair coming this week as well as some extra Fostex rings so I won't have to mess with changing rings. I didn't like the Mr Speakers Alpha pads or most of the others, I always felt suffocated wearing them. The Estat pads are what I am using on the TH900, just ordered another pair. I think the larger soundstage comes from the huge opening on the Estat pads, more like the HD800 pads and their large opening.
Tell me your impressions of the Dekoni pads vs stock on the TH900!
Do you have a link to the estat pads? I only see the Alpha pads on their site.