Yes, if you define runaway success as still not meeting the terms of the contract (the 139s have not been fully replaced by 189s yet).
As EE said, they hired the right people, most of whom were experienced military SAR crews so the standard was always going to be high. However, the financial fragility of the mother company and the extra costs of training (139 to 189) within SAR do cause me to wonder at the plan B if a 'Carrillion-style' mismanagement to save money results in them struggling.
When they have been going 5 years with consistent training levels, then you can consider it a runaway success perhaps.