Telegram chat friends who have A/Bed both ss and ds commercial versions are finding power requirements to be essentially the same even though ds is supposed to be 1 to 3 db/Mw more sensitive. So it seems if the dac/amp can’t drive ss well then it will likely also struggle with the ds.
Understandable considering there’s probably not many more than 50 Tungstens floating around excluding pre-production versions. Mine arrived just last Friday with a card indicating it was one of the first 20 double sided.
Should soon see some reviews coming out on yt from Zeos and others. There’s also currently a fair amount of discussions going on in telegram audio channels, which is how I first found out about it 4-5 months ago.