This Easyjet initiative has to be welcomed as it has the potential to make marginal routes more sustainable or previously unviable routes viable.
However, I have never heard a good thing about the transfer process at MAN and having 3 unconnected terminals won't help.
I have a colleague in Belfast that used to transfer over MAN but after two consecutive particularly bad experiences, she has sworn never to do so in the future. She now connects at LHR telling me it's much better or even drives to Dublin on occasions too. She describes the transfer experience at MAN as 'amateurish'. I'm certain she has shared that view with colleagues over there.