Yes, regarding Blue1 I referred to what Nick F describes, training bonds double the actual costs, several bonds when company decides to change a/c type, and in general a very bad treatment of employees. Add up a low salary and lots of work, a variable roster with few days off you should be better of in almost any other airline.
This is not only my personal view, IFALPA is considering to put a ban on this company for the practises of several bonds etc..