This is undoubtedly the most overly complicated, unintuitive, and user-unfriendly software ever! This is coming from someone who comes from a high-tech background, including programming, and has decades of genealogy experience behind me (would that be a pun?).
The one problem with open source software is that because it's not actually a company, there is nobody at the helm steering the ship, so the result in this case is the ship being lost at sea. They even tell you that it's not advisable to simply start using the software, that you need to read the manual beforehand (not really a manual as it's only available on-line). So, after a three hour tour, I was lost at sea.
A second problem with open source software is that the technical writing is generally horrible. The problem is it's written by programmers for programmers instead of as a tutorial for the end user.
What they have apparently done is pirate the GEDCOM standard and transmogrified it into something unrecognizable by other well-established genealogy programs. They even have the audacity to plainly state right in their own literature that the process of importing your old GEDCOM, especially if it's a large file, WILL cause... (Read the full review)