Actually, the rules for spending XP say that it costs 3, 6 and 9 XP to raise a talent to Level 1, 2 and 3. With the cool benefits from each level, that is totaly fine for me.
But the XP costs for skills are 5, 10, 15, 20 and 25 for the levels 1, 2, 3, 4 and 5. As you simply get one more dice with each skill level, the costs feel much to high.
If i were a player, my character would get every skill to level one, after that i would spend them in as many talents i can get my hands on. And for sure, every starting character will have 2 or 3 skills on level 3 only for the costs.
So, i think i will houserule the skillcosts. Level 1-3 cost only 5 XP each, 4-5 cost 10 XP each. It is not so easy to become a master in a skill.
What di you think about that?