Zero job security. You are expendable. If they can find someone cheaper who's willing to give up more of their personal life than you, you're gone. End of story. Don't buy in to their line of work/life balance, they will find any excuse to replace you with someone they believe they can get more out of. It doesn't matter if you're constantly ahead of schedule, if you can work harder and sacrifice more, you'd better do it or YOU WILL BE REPLACED.