This suit is just incredible. Simply that. I chose the 618 due to my slower fall rate. This suit is fast as hell but very controllable. I'm shocked at how much control I have. Swooping down to lower belly groups was always a challenge for me, now I don't even have to think about it and I'm down there. The flaws in my freeflying abilities were drastically amplified which really helped me to correct them and become a better flyer. It's very comfortable and the quality of the suit is impeccable. The customer service was awesome. Really nice people at Tonfly USA. Get this suit. Now.