I have to say having been a helicopter crewman, If you were to put me in a AS350 with an Arriel engine or an AS355 with Allison engines over water for 100 miles then I would chose the AS350 any day.
The feeling of the Twin Squirrel or TwinStar to US was that if you got an engine failure then the other engine took you to the scene of the crash.
My personal belief is with regard to the CAA's view on single engine helo ops near cities that it is not what the US can do it is what we cant do, the statistics prove I am right.
CAA = Jobs for the boys.
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Better to be up there wishing you were down here than be down here wishing you were up there!