The problems with the 427 were essentially that it was too expensive for what you got in comparison with other helicopters with basically the same engines. 427 was VFR and not Category A right away. It needed a second hydraulic system to be IFR, and had no AFCS in the basic ship, when the A109 was single pilot IFR, full autopilot, Category A capable out of the box and 20 knots faster for not much more money. Most people in N. America didn't need the second engine, and those in Europe who wanted / needed two engines also needed IFR and Category A.
The 430 suffered significantly by not having any training mode for training Category A. One of things most people don't realize with the new FADEC engines is that when you use 30 second and 2 minute OEI ratings, you can't use them when training, and a training mode work-around is needed. This killed any operational use of the machines in the UK (and probably the rest of Europe) stone dead. The other thing that didn't endear to the North American EMS market was the hover performance. At least one EMS operator wanted to use the machines, but said that the 222 out-performed the machine in any kind of elevation and temperature significantly. Range wasn't great, especially with wheels.
I'm very hopeful for the 429 - lot of work to make it right. And I hope Nick's assistance will help with things as well!