I have also used VLM and Euromanx and have been very satisfied with both. BA have never been very satisfactory and I no longer use them. I've always had a very good experience flying with VLM and Euromanx and both have consistently offered a great service. Euromanx have the flriendliest and most professional crews and they are by far more punctual than any other Isle of Man operator but Vlm have been quite good too and although they seem to carry very few passengers, they do try hard to please.
My colleagues and I use the Isle of man to London routes frequently and we're interested to see how things develop and who will ultimately take the lead and offer what we all need on this route.