Oh and avoid half movements, always train with a full range of movement. It only takes one day when you are not feeling upto scratch for you to go too low and hurt something. I know this doesn't necessarily apply to benching as the range is in the lower half, but proper develpment will happen only if you train in the full range.

Some people used to do short movements (I've seen people load a bar with 400lbs on squats and their arse barely lowers 2 inches) this has no merit whatso ever in my opinion.

If you asked them to go an inch lower, they'd hit the floor.