FWIW I worked for Norsk for 5 years on secondment from Bristow and I found them a great bunch of guys. Very professional. However that was in the days of Norsk still being majority owned by Norwegian and importing the experience from Bristow.
I can't say how the total "Bristowisation" has affected them but there are still guys in senior positions working for Norsk who I worked with and I can't rate them highly enough
Best wishes
John W