Ah the obligatory derogatory spotter comment..
SWBKCB, EZY would be much much cheaper, think around 20% of the cost (Citywing's lowest fares are £59.99 each way from NCL), x2 weekly A319 with £20 each way with a trusted brand name and all those little details like... Flight attendants? Would undoubtedly be more popular.
EZY has created quite a market for themselves on the IOM too. But I think Citywing is quite a formidable competitor, I suppose we will see if EZY ever go after them IOM-BFS