The reason why their EMS shipping is still slow is they have to order it from their supplier. AFAIK 'most' of their stock isn't actually held by them, labor/storage costs and whatnot.
Air mail: Order received, waiting for supplier, packaged, sent to HKPost office, sent to you.
EMS: Order received, waiting for supplier, packaged, sent to HKPost office, sent to you.
Now if waiting for supplier wasn't in there EMS would be quite a bit faster.
As for people wanting to buy the CycloDS from DX now, don't bother. They're probably backordered by now. Heck they were probably backordered a few hours after the listing went up.