I got my little blue book yesterday and It's worth £50K with a job, without? £0.
So in answer to your question: Yes, it will have all been worth it when I get a job!
My best advice to you and anyone else who is thinking of, and hasn't starting training yet: Get onto a scheme where you are much more likely to be employed at the end ie. easy sponsorship, ctc mcalpine, buzz/cabair etc..
If you apply for sponsorship and don't get it after a few try's with different companies, then do something else and save yourself £50K (that's what I would do, if I was thinking of it all over again.)