I left Gulf Air three and a half years ago. It was the start of a mass exodus and there were half a dozen who went to the same airline. Apart from the guys who were a bit skinny on experience, we have all upgraded successfully. A few have even gone on to check airmen status very quickly.
It is a golden age of quick progression and I would suggest First Officers floundering in an airline going nowhere, professionally foolhardy.
Apart from quick professional progression. The standout experience at my new airline was how guys stick together. GF was very 'contract world' in attitude amongst pilots ie: " I'm alright Jack how about you? ".
Good luck to all. And my outfit needs pilots. I'm happy for PM's and can assist in applications.