If i had to rate Gramps with one feature or favorite feature, would be: The developers of the software are also genalogists and users of the software!
Love the concept of GRAMPS! It is modular, has plug-ins like PhotShop or GIMP. I see a strong program one day. The problem is it just isn't ready for the public yet.
Lots of potential however the program crashes (in windows 7) every hour and now the windows-controls have disappeared and the window cannot be resized. I applied for bug account but never received the verification (20 hours and waiting). The interface is confusing and many simple features are missing like a middle name field. adding parents is a tedious task.