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Toni's analysis is spot on. Money is certainly part of the equation, but what matters most is that you are getting to do the kind of work you love to do most of the time. If you love what you're doing, you will be AMAZINGLY good at it, and that will get you more pay increases and promotions than anything else. If you need to move on in order to do what you want to do, or to get away from people you don't like working with, so be it. Accepting a counter-offer is almost never the right answer.