I for one don't use it, if I fly correctly I'm unlikely to "bust" any limits during normal ops.
True. It seems to me that the only operators who fly with it ON all the time either don't fully understand this function or see it as protection from major overtorque. If you fly within the RFM limits, it serves no purpose.
Worst case scenario: pilot gets way behind the power curve and has to grab a big armful of collective to save the airframe. TQ LIM ON will limit the PI. Saves the MGB, but possibly not the airframe.
Based on previous comments it sounds like having it ON would not be a factor and would therefore depend on pilot ability to hit the correct OEI profile...the aircraft performance would not be degraded as a result of TQ Limiter ON?
That is correct. TQ LIM will not affect the good engine.
But again, it's only real purpose is for use during OEI training, not daily flying.