The guillotine press – where you bring the bar down to your neck instead of the lower pecs – is a great chest developer. But there is risk. Keep these light and under control. This is not a bench press variation to go heavy on. And don't try to set a PR! This is bodybuilding, not powerlifting.
My favorite way to use it is 6 x 6 with 20 second rest periods between sets.
Let's cut the bullshit and get to the brass tacks. For decades, men built slabs of muscle with simple, three day-per-week training programs. They trained their whole bodies in one brief workout session and they grew big and strong. Scoff all you want, but tens of thousands of trainees can't be wrong.