Pros: I fly AMS to MAN regularly for work. There are a number of providers, but KLM far exceed the experience offered by low cost airlines, often for the same price even at short notice. You get a drink and snack; and at no annoying sales announcements. Miles club membership is free, even if you don't fly regularly well worth it as it halves the cost of cost of checked baggage. Peaceful airline with no hidden costs during booking.