I haven't used much genealogy software, so I can't say how it compares to them. It runs on Linux, which was my primary requirement.
1 - Finds Possible Duplicate People, allows you to review and merge or not merge.
2 - Import and export GEDCOM
3 - Useful reports - Ahentafel, etc.
4 - Generates websites and booklets
Check their website to see what all the features are. I haven't been using it long enough to give a full review.
SUPPORT: For glitches with the software itself is good. For genealogy in general, there isn't a lot of hand-holding. If you know what you are doing and just need the software end of it, it's excellent.