I might have to try those. They sound killer. I have tried skull-crushers with DB, (on a bench) but I felt like I got a better burn and pump in my tri's with a BB. (EZ curl) Does doing them on the floor provide a better stretch or ROM?
The floor is just another variation. I keep my legs straight out in front of me and when I touch the floor...I know I have went deep enough. Be sure to touch the entire dbell to the floor though...full stretch.