Anyone done one and felt a big difference between it and a Sprint?

It's somewhere between a regular sprint and an olympic distance tri.

Sprint: 750m swim, 20k bike, 5k run
Super: 1000m swim, 24k bike, 8k run
Oly: 1500 m swim 40 km bike - 10 km run

I signed up for one at the end of May, and now I'm getting nervous. It will prolly add about 8 mins to my swim, 10 to my bike, and maybe 15 mins to my run.

It sounded ok in theory, but I'm nervous now!