If the Magus never had to make any concentration checks to cast spells that appear on the Magus spell list? I don't think it would make the class unduly powerful. I mean, they are a class that absolutely focuses on casting spells inside of the cluster-f$#k of melee every single day of his career, I don't think it unfeasible that someone in this situation would figure out a way to make it work.
This would eliminate the feat tax of combat casting, and would free up a few levels worth of abilities.
Your thoughts on what this would do?
Opps, put this in the wrong forum, flagged for a change.