Like most (all?) of the Linux video editors you have the occasional crash. It happens way less than Openshot or Pitivi but it's still present. I don't know if it also happens on Windows or OSX.

You can version control your edits and do text operations since it's a MLT file so that helps.

Not really my thing but you can insert HTML5 overlays and animations. There's a demo on the youtube channel but it's quite "verbose" for most users.

GPU accelerated filters are really fast and I have no problems working with 1080p 15GB+ files. But that's nothing compared to what professionals use so I can't really comment on that.