Cleaned it, filled it, all orings lubed and in place, and it leaked like a sieve for about 15-20 seconds, then just stopped, and is now working fine. I'm really liking it so far, but I need to figure out why that leaking occurred.
I definitely get more flavor out of this than the Lemo Drop or Subtank Mini, like gobs of flavor, and it did bring lots of "cloud vapor production," as the box promised.
Oh, and that prebuilt coil is reading .5 ohms, unlike the prebuilt on the Drops, which usually read 1.1 ohms.
I'm going to just keep editing this post (with additional thoughts and observations), rather than cluttering up the whole thread.