I had gyno removal just under 2 years back. The results you saw straight after the surgery is what the end result will be. However, in the weeks following the surgery, you will get some swelling, bruising and fluid build up. My right pec was swollen quite badly but it resided after a few weeks and looked fine.
At the moment, I would say that my left pec looks 100% perfect, the right around 85%. Therefore, it's not as symmetrical as I would have liked but it's a big improvement on having bitch tits.