One thing that's an issue for me, because I don't like things spoiled, is that it unlocks abilities that I haven't unlocked on the actual job yet. I got a certain sense of enjoyment out of hitting a level, doing my quest and finding out what my new ability would be. Now, my hotbar is full of level 50+ skills and abilities and it just seems wrong to me that they're there. I did, however, enjoy playing jobs at lvl 60 when I'm only level 50, because it gave me a preview of what it's like. The downside to this, though, is there are players who aren't bothering to use their new abilities because everyone is rushing through the floors. They feel like they aren't afforded the time to learn them.