What do you like or dislike about swim fins?

I swim between 8000 and 14000 meters a day as I train for the 2012 Olympic trials and I use my fins every practice. but when I say use them I mean really use them.. My coach says if you have fins on the I want to see you kick your heart out... Fins are great when used right but can hurt you when you start thinking you always need them

I swim between 8000 and 14000 meters a day as I train for the 2012 Olympic trials and I use my fins every practice. but when I say use them I mean really use them.. My coach says if you have fins on the I want to see you kick your heart out... Fins are great when used right but can hurt you when you start thinking you always need them