For the record:
The first prototype of the NH90 (PT1) did not have FBW.
The other four prototypes (PT2 - PT5) have or had FBW controls on the left side and mechanical back-up on the right.
Indeed since december 2003 PT3 was the first NH90 to fly Full FBW and later also PT4 was coverted to Full FBW.
All production helicopters of the NH90 have Full Fly-By-Wire controls.
The big advantage that i see with FBW is that you can get rid of the cross-coupling effects of mechanical controls by programming the control laws the correct way.
For your information: it flies very nice
