The first, obvious one is that characters will improve more slowly, just a few skills per scenario. This isn't necessarily a bad thing, but I wondered if others have noticed this in actual play - particularly compared to old school RQ.
The second is that since players need to choose where they spend their increases, this might lead to more focussed development. I quite liked how characters risking use of a low skill in a stressful situation used to gain an increase if they succeeded, even though that might not have been a primary ability for them. The player might be less likely spend an improvement roll if it's going to take a lot of increases to get the skill to a reliable level, so their secondary skills might stay low.
This is all just in my head, though, so I'm wondering what the experience of players and GMs has been!
