Longtimer,
You don't get a very good flavour of the airline on here, best way to find out is try them and see for yourself. Plenty of sub £5 base fares out there. The most expensive, riskiest, and frustrating part of your journey will probably be the trip to the airport. A day trip to Dublin is pretty easy to do from many parts of the UK, so just try it. If you don't like them then spend your money somewhere else.