I'll admit it, sport mode makes the car really fun. I use it when merging on highways mostly, and sometimes in the city.
When I drove an AT S Touring HB I used the sport button often for specific scenarios. True, you don't need it, but it did make things a lil more exhilarating and fun. That was my excuse at least to go faster.. I may owe a few Hail Marie's for that one.Never. I don't feel I need it in my 2.5. Not that I'm thinking I have a racer car lol. I use manual mode with paddle shifts when going downhill.