Well while we're all telling on ourselves, I was so excited to get my UFS in I pulled a really smart move. AS anxious as I was to try it, I still disassembled everything, inspected and lubed up the O-rings, etc.
Carefully puiit a new 901 atty in but when I tried to
vape it, I got nothing but a dirty metal taste and no vapor. The dirty metal taste went away of course and that was when I opened the unit up to get a better look at the atty.
There was no
juice in the damned thing.
I guess that's one way to insure no leakage! 
Hard on atty's though...