As has been said by the numerous posts above....i'd also recommend sticking around for the time being and taking the course, especially considering the current climate. Put in the hard slog now when times are fairly tough then when your bond is up, hopefully by then things will be good once more. There are plenty of Licenced guys out there and they cant find work...and they are guys who are probably typed on every aircraft under the sun.
As for a training bond...you are entering into a contract. It is worth the paper its written on. No solicitor could fight your corner for you if you just upped and left without paying the money to leave. *Beware*!!
When u finished my apprenticeship i also had my licence complete and in my hand..Full B1. I thought this was great...until you then realise that a b1 or b2 is basically worthless without both a type licence and experience.