Dorian Yates is a huge proponent of declines. He trains guys even today to do them and skip the bench saying they are a much more complete overall chest movement hitting all but the upper chest. The key is to bring the bar to mid chest...remember that the stretch will be extreme so don't get crazy going down in the movement. Take the elbows down to just a little below parallel so as not to tear or pull anything. I do the movement to mid chest and also bring the bar to the lower chest as well hitting mid and lower chest.