Liked the tweaks to the classes. Finally a reason not to PRC (Extra +1 HP and class specials) or limit it to a single PRC or two like Archmage and Loremaster for a few level dips. DR for fighters based on armor.
Liked the basic concept of a +2 to the primary ability ability score when all was said and done in the end usually belonging to the favored class regardless of how the PC was generated by point buy or rolling (Less reason to chase after a strange template or higher ECL race).
Liked the concept of picking the favored class of the PC.
Liked the Sneak Attack fix.
Liked the bogus feats that were rarely used in game and dropped.
Generally liked how the skills worked, definitely an improvement IMO.
Would like to have seen Sorcerers get 4 or 6 skill points since there primary attribute is Charisma.
In a leveling up game I favor a second full hit die based on size and race with minimal skill points (No +3 skill points which would be due to having a class). It would be be a nice way to denote sub adults in game without class levels or many skills.
Got confused by one thing the fast and slow advancement. It seemed like it was campaign dependent for each game in the beginning of the Alpha but class based in the back of the PF Alpha.