Though +5 Focus is not a lot (especially for a Lv7 Talent), The Complete Self sounds as if it might synergize with multi-hit spells such as Mind Blades, Antipathetic Field and AoEs.
Sadly, two things need to be taken into consideration:
The Complete Self only has a 33% chance to trigger.
Contrary to Beguiler's passive, The Complete Self will only trigger once per Spell hit, no matter the number of targets hit.
AoEs such as Silent Scream will at absolute most benefit from +