I'm afraid there is just no way that I can see Esperia working out - their website looks like it was designed for a school project and is written in pigeon English.
If they ever did get off the ground they would be flying to 16 destinations with 3 ageing aircraft, which would leave them in a fairly precarious situation if any tech issues were to arise. All of these factors (apart from the website issues) ring a bell with me - the last thing Manston needs is another EUJet.