Does anyone use the Learning table from EssCo and how did it work out.
Altering DP for learning spells for that level is an interesting idea. And if you have access to a university, you don't have as harsh of penalties from increasing more than 5 Ranks/lvl.
Since my game has more of a D&D Greyhawk setting, I've also wondered about Essence users finding their spells in books, for some Spell Lists.
This makes the Guildcraft Mastery List more important/beneficial, although some of those spells need to be reworked. A 16th lvl spell that Repels Large Vermin (3rd lvl) for 3 hrs sounds a bit weak to me. But a 50th lvl spell that allows you to make a Spell Book which you can use as Runes or +25 to learn the List (I'd say Research, too.) is pretty cool.