[qbasic_forever]

I wouldn't turn down the opportunity if fresh out of school or still very early in career. Worst case you get laid off and are back on the market and not really any worse off than when you were looking earlier.

Once you're mid and senior level it's a bit harder to hop out and into a new job on very short notice--you really need clout and the right place at right time, or connections/network of companies that are hiring.