Leg press machines are most definitely not the same. They differ in design and quality. Unfortunately, due to the nature of the exercise and machine you must pay for a good one.   The leg press is the exercise a lifter can generally lift the most weight. Plus, the weight is pushed to roughly shoulder height – requiring a solid support structure. So, it is not a stretch to think this machine is not going to be cheap.   A cheap leg press can suffer from many issues. Range of motion, poor movement on cheap rollers or bearings and a lack of adjustability. They do not feel like they are targeting the quads or could be straight out dangerous.  If you can’t afford a quality leg press, I suggest you stick to squats.