While my personal preference is to use mostly free weights, the hammer strength machines are in fact one of my favorites. The hammer strength machines are very nicely designed to closely mimic natural range of motion and movement. Another big plus of these machines is that when you don't have a spotter, you can still go quite heavy while minimizing the risk of injuring yourself.
Adjust the seat height to a level that's appropriate for your height and grasp the handles on the machine
Lift the weights slightly off from the rests, then press the weight forward in a controlled motion
Then bring it back down to starting position without it touching the rests before starting the next rep
Hammer Strength Decline Press
Of all the machines designed for chest exercises, the Hammer Strength line of exercise equipment is one of my favorites. They provide a very natural range of motion, and always gives a good workout.
Position yourself on the hammer strength machine and adjust the seat to an appropriate height for you
You may need to buckle the belt when pressing heavy weights to prevent yourself from sliding up the inclined bench
Press the weight up and then lower back down to starting position
With the three hammer strength bench presses exercises listed above, you can get a pretty good workout for your chest without needing a spotter. The incline, flat, and decline press exercises covers your chest workout from all angles. But as good as these machines are, free weights should still be your bread and butter for your workouts.