I did not test it myself, but if it works as tooltip says, it´s overpowered. "non crit" damage is multiplied with Combat advantage bonus. Most chars have arround 30-45%. So your 100 damage will be 130-140 with CA, that companion spends another bonus leading to 155-165 damage. Crit damage is not directly multiplied. At 115 critseverity and 45% CA bonus that 27,5% will be a 10,6% +dps, wich is better than any other companion as far as I can tell.
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"non crit" damage is multiplied with Combat advantage bonus. Most chars have arround 30-45%. So your 100 damage will be 130-140 with CA, that companion spends another bonus leading to 155-165 damage.
Crit damage is not directly multiplied. At 115 critseverity and 45% CA bonus that 27,5% will be a 10,6% +dps, wich is better than any other companion as far as I can tell.