Jet Qualified it seems I was mistaken regarding your background - no offense intended.
Yes I know the story has not been all roses with Cabair/KLMuk, but guys have come out of it well because the training at Cabair is well respected in the industry. If KLM do not take on the guys after the 30 months, then I believe there is an understanding that you can get a job elsewhere and forget the bond - saving a few quid in the process.
I am on the sponsorship myself, and have had only positive experiences to date, others may no doubt paint a gloomier picture from their own expeience! But past performance is not necessarily a guide to the future.
At the end of the day, for all the previous faults of the scheme, it is undoubtedly a good way of getting into that first airline job, which is the main consideration here.