Our group is still trying to get our heads around Aspects, and compelling Aspects in particular. Since examples seem to work the best for me, I'm simply going to give you two from our last session and see what people's opinions are.
Example 1. Agent Blair is standing in front of a group of angry shifters. Beside him, veiled, is Hanna, with a big ol' Norse hammer. After a few words, one of the shifter's, a big grizzly decides he's had enough of the small talk and charges Agent Blair. Hanna's player goes for a self-compel at this point, compelling her "Got your Back" aspect and stepping in front of the bear and playing whackamole to his big, furry noggin. In the process, she gains herself a fate point.
Hanna could have stayed veiled and remained unseen, but chose to limit her options and protect her friend. On the other hand, the player would have probably taken this action anyway, just because Hanna wanted to hit something with her big 'ol hammer. Proper use of a compel, or not?
Example 2. Later in the scene, after laying waste to lots of Gruffs, the bear finally starts to come around (it was a good hit with the hammer). By this point the group realizes that the bear really isn't the enemy. Hanna feels bad for the bear due to her Trouble Aspect, Two-ton Conscience. Once more going for a self-compel, she goes to work trying to administer first aid to the big lug, despite the fact that he might be looking for payback. Once again, Hanna gets a Fate point for the self-compel.
Choosing to get down and personally help the grizzly was a risky move, but again, this is something Hanna probably would have done anyway, being a doctor and all. Did she deserve the fate point?
Opinions appreciated.