How far are you towards your ATP? If you are already getting 80 hours a month, why switch? Is CFI your life long goal? Point being, if you are going to go to Aerosim and take the bonus and free training, you are going to owe them back a commitment of a year or more. If you quit before then to move on to another job, you owe them all that money back. If you are already within a year of hitting your ATP mins, stay where you are.