Still wishing they would errata or faq this. The kensai is so potentially cool, but the tradeoffs of perfect strike (yuck) for spell recall and then a not really much better fighter training for spell knowledge, (not to mention completely losing your 10th level ability as an effective one) is just too much.
The flavor is great, but getting 2.5 pts or so more damage is not worth losing an extra shocking grasp, or whatever spell you need more of. and getting fighter level feats at level -3 instead of level/2 but only for 1 weapon isn't an upgrade of the ability it effectively replaces, and it causes loss of an extra ability.
And Critical perfection for a magus arcana? also really bad trade-off. Better would be if this replaced the 10th level fighter training, that would make more sense.