Have you applied & been offered a job? I'd be suprised if you've got that far and still don't have any info about Britannia.
If you're just thinking about it, then why not apply? By the time you pass the maths, English, pschycobabble and sim' checks, then the interview, I'm sure you'll have learned or been told enough to make up your mind.
Some people have already jumped ship, lots more have stayed put. Whether it's worth it or not depends upon your personal circumstances, but if you never apply, you'll never have the choice.