Anyone use them before??

I've looked at them but I didn't like the cutting diameter. Normally I use 220 grain broad heads anyway.

yes and killed my first buck with a bow... for the price i would buy"if not just to try out...

Bought the carbon express f-15's for my girlfriends brother. We got to shoot them the other day and they fly almost exactly like his field tips. He has not shot a deer with them yet, but based on the youtube videos of them they look like they would do some damage. Will keep you posted if we get a buck this weekend.