So far everything works.
What does not
It can crash with very big PDF files with very many annotations, but not consistently. If I save it often, I don't find it a hassle.
What was not tested
Most everything was tested. I'll update this if I later find something that doesn't work.
|Ubuntu 14.04 "Trusty" amd64 (+ variants like Kubuntu)
|Mar 08 2017