From the pilot point of view the T2 is a dream to fly since it's so benign and save thanks to all that power and duplicate systems. For corporate it's a bit rough with that rigid rotorhead but I know of one former owner who was reluctant to let his go.
But this is only the 4ht type I have been flying seriously so my experience is a bit limited. All I can say converting onto the EC135 is not as mind boggeling as one would expect due to it's "simplicity".
Ours is on it's thrid gearbox though two went because of input driveshaft metal entering the box. I think that is what it was. In any case we found metal shavings in the MGB oil. We have also had a great number of ARIS pods fail on us but this has been resolved now.