One of the complaints/problems I've run into with previous incarnations of Fate were with character advancement. To be blunt, there wasn't any, or it wasn't satisfying for those familiar with more mainstream RPG gaming.
That is, without a doubt, a 'fixed problem' with Fate Core and FAE. The best demonstration of that I've found have been with write-ups like these: Conan's entire career as a series of FAE milestones.
A couple other great examples are Batman: Year One (http://station53.blogspot.com/2013/10/this-post-is-inspired-by-dt-butchinos.html) and Luke Skywalker in Star Wars episodes 4, 5, and 6 (http://mdpaste.appspot.com/p/agdtZHBhc3Rlcg0LEgVQYXN0ZRjZ6xgM).
Character Highlight: Robert E Howard’s Conan – Through His Career (FAE)
Hither came Conan, the Cimmerian, black-haired, sullen-eyed, sword in hand, a thief, a reaver, a slayer, with gigantic melancholies and gigantic mirth, to tread the jeweled thrones of the Earth under his sandalled feet.” – …