If I am not mistaken the first AS355 ( E ) had single hydraulics Aerospatiale chose to upgrade rather than a complete new model ( although to add 200KG payload there must have been a lot of other stuff )
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/3aa81c81935cec4b862573d000597d93/$FILE/H11EU.pdf
The light twin has to be the hardest market out there as there are probably more choices available than in the SE catagory.
AW EC and MD have many years jump on Bell , it is going to be a long hard road for them I think.