just a bit worried if management will take advantage of these new pilots
They can't treat you any better or worse than any of the other pilot's under the same EBA. Remuneration and conditions will be the same. The only difference will be a ROSO which to my understanding is five years in this case.
A few years ago, five years was peanuts - these days, a little longer considering you could be in another airline within two to three depending on how hard you work in GA. For a brand new starter however, I think it's a fantastic opportunity. Not that I agree with it, but for a first job with everything paid for, it's definitely worth a shot.