That is, I think it's of at least some importance, maybe not a whole lot.
In the Mathematics chapter of the guide, Evasion is equated to 1/3 Agility plus 2/3 Survival. This is surely an error. As confirmed later on in the guide, in a section devoted to attribute allocation, Evasion appears to be equal to 1/3 Agility plus 2/3 Speed.
I have upgraded my two characters 13 levels while remembering the equation and forgetting the suggestion for attribute allocation. On "Very Easy," however, I have had no trouble at all with any enemies, so I am going to continue. But I will be thinking more seriouosly of putting some points into Speed. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />