I have one myself and it is semi-symmetrical as they all are. They are known as a sports trainer, I have a Sensei that is a flat bottom trainer and the wife and kids can putt putt in that one all day, but they always have an issue with the Avistar lol. Anyways I only have a older OS40 in mine, while it does OK, I still long for more lol. I am getting a 60 size mid wing for more though and putting a 75 2 c in the nose, that should do the trick