I found this program to be overly complicated. Not so much that you cannot figure it out by playing with it long enough, but it could be much simpler. There are too many small icons that are hard to figure out what they mean, and it took a while for me to figure out how to create a family union with offspring, etc.
That being said, it is free, so if you need a free family tree program, it's worth looking at.
I recently started researching my family tree, and so far the best program I have found is MacFamilyTree. Although it's not free, I believe the interface is very simple and powerful.