30% Chance To Cast Level 21 Enchant When You Kill An Enemy
+40% Faster Hit Recovery
+370% Enhanced Damage
-25% Target Defense
Adds 3-14 Cold Damage (3 Seconds Duration,Normal)
-25% To Enemy Fire Resistance
40% Chance of Crushing Blow
+200-300 Defense (varies)
+10 To Strength
+10 To Dexterity
All Resistances +20-30 (varies)
Requirements -20%
Level 12-17 Meditation Aura When Equipped (varies)
+35% Faster Cast Rate
+200-260% Enhanced Damage (varies)
+9 To Minimum Damage
180-250% Bonus to Attack Rating (varies)
Adds 5-30 Fire Damage
+75 Poison Damage Over 5 Seconds
+1-6 To Critical Strike (varies)
+5 To All Attributes
+2 To Mana After Each Kill
23% Better Chance of Getting Magic Items
Pretty much nails it. Only good thing with Insight is for casters with mana issues.
Bolded = pretty much all damage increases.