Li Shenron
Legend
What are your experiences? Do you use the XP model? or the Story Line model? Which do you prefer?
I like the idea of using standard XP generally, but they often don't feel like matching the difficulty or effort required by a challenge. In any case, I also always give XP for quests, plot achievements and other non-combat challenges, so at least these are all made-up.
Personally I prefer (also as a player) a slow and DM-orchestrated advancement that gives everyone enough time to try out and learn to use all their character abilities before getting new ones. I also think that slow advancement helps to stop thinking about next level and focus more on the 'here and now' of the adventures.
But by "DM-orchestrated" I don't necessarily mean plot-synchronized. I don't like the idea that the adventure is tweaked to match the PC's level, and neither viceversa. I prefer to think that adventures are as difficult as they are, period, and it's up to the PCs to decide if they want to take on a risky one or let it wait and go somewhere else (hint: sandbox).