Your experience, like mine, seems to indicate forward progress in atomizer design over time, regardless of the country of origin. Good news for everyone getting into vaping now. The DID style rba's appear to be the pinacle of current design and operation.
The DUD is my first true RBA and unless I opt for a larger tank, I have no reason to switch to anything else. Now I just keep giving away my stockpile of clearomizers to friends and familily to get them started.
Pretty much the same sentiment here.
I have four of the DuD's in house, and have all of them working very well. I'll still want to get several more since I generally have at least four or five juices in rotation on any given day. Though I am considering holding off for a while to see what's around the corner that may have a better form factor on Provari Mini.
Though I have gobs of atty's, carto's, and clearo's on hand, these have quickly become my daily device.
As to the concern expressed by some regarding the metal used in the DID clone, I see far less risk of brass metal leaching from these than from the DUD itself. Unlike the DID, the DuD uses SS post and nuts rather than brass, and the chrome plating appears well done.