This seal is ideal for soloing, especially in long fights, by keeping the paladin alive through supplying HP. This versatility also gives it the potential to be used during tanking if extra healing is needed. Keep in mind, however, that not using a damaging seal will reduce the threat generated.
Melee attacks while Seal of Insight is active no longer heal you, but instead heal a random injured member of your party or raid for 45% of the normal amount.
Patch 6.0.2 (2014-10-14): No longer increases spell Haste by 10%.
Patch 5.4.0 (2013-09-10): No longer has a chance to restore mana on attacks.
Hotfix (2012-12-21):The self heal from Seal of Insight will trigger approximately 33% more often.
Patch 5.0.4 (2012-08-28): Redesigned. Fills you with Holy Light, increasing your casting speed by 10%, improving healing spells by 5% and giving melee attacks a chance to heal you and restore 4% of base mana.
Patch 4.3.0 (2011-11-29): No longer returns 15% base mana to the paladin when Judged. Judging Seal of Insight still causes damage, and melee attacks will still restore 4% of base mana.