Maybe its my way I am but...
When I go looking for a job and get an offer I will never accept a counter offer from my own company. Whether you need more money or you are not happy with the current benefits, if your company did not treat you correctly in the first place you would not looking for a new job. This way, if you move back to your company after a couple of years they know that you do not bluff, you are decisive and you don't do tricks. I also do not exercise ultimatums since they are a kind of bluff. You will also build up a name for being professional.
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