Don't take this the wrong way but this topic comes up daily now and it starts huge arguments that deteriorate rapidly. Call Ginn and ask what they change. Do some research on here and find out what the other companies change. Then made a decision based on the tons and tons of feedback already here and YOUR own research. You simply CANNOT make a generalized question about this and expect a single direct difinitive answer.
Do you want to LEARN about what the different chip companies do to tune their ECU and what is ultimately going to run/protect your car or do you want somebody you've never met to give you warm fuzzies about xxx ECU upgrade?