The 2Excel DA62s have been patrolling the English Channel fairly constantly from both Lydd and Humberside as part of the UK Bristow contract. No reported problems although I accept that the Channel is somewhat more pleasant weatherwise than the Atlantic coast.
2Excel also have the bigger King Air (still used in he Channel) and I guess that Bristow and the UK and Irish Coast Guards will one day make a call on whether the DA62 can do the job of the King Air based on actual performance. The same call that led to the changes in helicopter operations for the new contracts..